Dihydroquinoxaline and dihydropyridopyrazine derivatives as RSV inhibitors

ABSTRACT

The present invention discloses compounds of Formula (I), or pharmaceutically acceptable salts, esters, or prodrugs thereof:which inhibit Respiratory Syncytial Virus (RSV). The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from RSV infection. The invention also relates to methods of treating an RSV infection in a subject by administering a pharmaceutical composition comprising the compounds of the present invention.

RELATED APPLICATION

This application claims the benefit of U.S. Provisional Application No. 63/048,796, filed on Jul. 7, 2020. The entire teachings of the above application are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates generally to compounds and pharmaceutical compositions useful as Respiratory Syncytial Virus (RSV) inhibitors.

BACKGROUND OF THE INVENTION

Human respiratory syncytial virus (HRSV) is a negative-sense, single stranded, RNA paramyxovirus (KM. Empey, et al., Rev. Anti-Infective Agents, 2010, 50(1 May), 1258-1267). RSV is the leading cause of acute lower respiratory tract infections (ALRI) and affects patients of all ages. The symptoms in adults are usually not severe and are typically analogous to a mild cold. However, in infants and toddlers the virus can cause lower respiratory tract infections including bronchiolitis or pneumonia with many of them requiring hospitalization. Nearly all children have been infected by age 3. There are known high-risk groups that infection with RSV is more likely to progress into the ALRI. Premature infants and/or infants suffering from lung or cardiac disease are at the highest risk to develop ALRI. Additional high-risk groups include the elderly, adults with chronic heart and/or lung disease, stem cell transplant patients and the immunosuppressed.

Currently, there is no vaccine available to prevent HRSV infection. Palivizumab is a monoclonal antibody that is used prophylactically to prevent HRSV infection in high risk infants, e.g. premature infants, and infants with cardiac and/or lung disease. The high cost of palivizumab treatment limits its use for general purposes. Ribavirin has also been used to treat HRSV infections but its effectiveness is limited. There is a major medical need for new and effective HRSV treatments that can be used generally by all population types and ages.

There have been several RSV fusion inhibitors that have been disclosed in the following publications: WO 2010/103306, WO 2012/068622, WO 2013/096681, WO 2014/060411, WO 2013/186995, WO 2013/186334, WO 2013/186332, WO 2012 080451, WO 2012/080450, WO 2012/080449, WO 2012/080447, WO 2012/080446, WO 2016/055792, WO 2016/097761, and J. Med. Chem. 2015, 58, 1630-1643. Examples of other N-protein inhibitors for treatment of HRSV have been disclosed in the following publications: WO 2019/094920, WO 2019/067864, WO 2018/226801, WO 2017/015449, WO 2004/026843, J. Med Chem. 2006, 49, 2311-2319, and J. Med Chem. 2007, 50, 1685-1692. Examples of L-protein inhibitors for HRSV have been disclosed in the following publications: WO 2019/199908, WO 2019/006295, WO 2019/006291, WO 2017/123884, WO 2011/005842, WO 2005/042530, Antiviral Res. 2005, 65, 125-131, and Bioorg. Med Chem. Lett. 2013, 23, 6789-6793, Bioorg. Med Chem. Lett. 2017, 27, 2201-2206. Examples of nucleosides/polymerase inhibitors have been disclosed in the following publications: WO 2013/242525 and J. Med Chem. 2015, 58, 1862-1878.

There is a need for the development of effective treatments for HRSV. The present invention has identified these novel compounds and their inhibitory activity against HRSV. The invention includes methods to prepare the compounds as well as methods of using these compounds to treat disease.

SUMMARY OF THE INVENTION

The present invention provides compounds represented by Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof that can be used to treat or prevent viral (particularly HRSV) infection:

wherein: A is selected from the group consisting of:

1) optionally substituted aryl; and

2) optionally substituted heteroaryl;

B is selected from the group consisting of:

1) optionally substituted —C₁-C₆ alkyl;

2) optionally substituted aryl;

3) optionally substituted heteroaryl;

4) optionally substituted —C₃-C₁₂ cycloalkyl; and

5) optionally substituted 3- to 12-membered heterocycloalkyl;

L is absent, —CONH—, —NHCO—, —NHCO₂—, or —NHS(O)₂—; preferably L is —CONH—;

Z₁, Z₂, Z₃ and Z₄ are each —C(R₁)— or N, provided that at least two of Z₁, Z₂, Z₃ and Z₄ are —C(R₁)—;

Each R₁ is independently selected from the group consisting of:

1) hydrogen;

2) halogen;

3) cyano;

4) nitro;

5) optionally substituted —C₁-C₈ alkoxy;

6) optionally substituted —C₁-C₈ alkyl;

7) optionally substituted —C₂-C₈ alkynyl;

8) optionally substituted —C₃-C₆ cycloalkyl; and

9) optionally substituted 3- to 6-membered heterocycloalkyl;

Each R₂ and R₃ is independently selected from the group consisting of:

1) halogen;

2) cyano;

3) nitro;

4) optionally substituted —C₁-C₈ alkoxy;

5) optionally substituted —C₁-C₈ alkyl;

6) optionally substituted —C₂-C₈ alkynyl;

7) optionally substituted —C₃-C₆ cycloalkyl; and

8) optionally substituted 3- to 6-membered heterocycloalkyl;

alternatively two adjacent R₃ groups are taken together with the carbon atoms to which they are attached to form an optionally substituted fused carbocyclic or heterocyclic ring;

Each R₄ and R₅ is independently selected from the group consisting of:

1) hydrogen; and

2) optionally substituted —C₁-C₃ alkyl;

Alternatively, R₄ and R₅ are taken together with the carbon atom to which they are attached to form an optionally substituted 3- to 6-membered spiro-carbocyclic or spiro-heterocyclic ring;

m is 0, 1, 2, 3 or 4; and

v is 0, 1, 2, or 3.

Each preferred group stated above can be taken in combination with one, any or all other preferred groups.

DETAILED DESCRIPTION OF THE INVENTION

In one embodiment, the present invention provides a compound represented by Formula (I) as described above, or a pharmaceutically acceptable salt, ester or prodrug thereof.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein each R₁ is halogen, optionally substituted —C₁-C₃ alkoxy, or optionally substituted —C₁-C₃ alkyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein each R₁ is hydrogen, F, optionally substituted —OCH₃, or optionally substituted —CH₃.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein each R₁ is hydrogen.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein m is 1, 2, 3 or 4, and each R₂ is independently halogen, optionally substituted —C₁-C₃ alkoxy, or optionally substituted —C₁-C₃ alkyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein m is 1 or 2 and each R₂ is independently F, optionally substituted —OCH₃, or optionally substituted —CH₃.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein m is 0.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein only one of Z₁, Z₂, Z₃ and Z₄ is N. In this embodiment, preferably Z₁ is N or Z₄ is N.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein each of Z₁, Z₂, Z₃ and Z₄ is CH, and m is 0.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein only one of Z₁, Z₂, Z₃ and Z₄ is N, and m is 0.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein v is 1, 2 or 3, preferably v is 1, and each R₃ is halogen, optionally substituted —C₁-C₃ alkoxy, optionally substituted —C₁-C₃ alkyl, or optionally substituted —C₃-C₆ cycloalkyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein v is 2 and each R₃ is independently selected from halogen, optionally substituted —C₁-C₃ alkoxy, optionally substituted —C₁-C₃ alkyl, and optionally substituted —C₃-C₆ cycloalkyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein v is 2 and the two R₃ groups are adjacent and are each independently selected from halogen, optionally substituted —C₁-C₃ alkoxy, optionally substituted —C₁-C₃ alkyl, and optionally substituted —C₃-C₆ cycloalkyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein v is 2, the two R₃ groups are adjacent, and the two adjacent R₃ groups are taken together with the carbon atoms to which they are attached to form an optionally substituted fused carbocyclic or heterocyclic ring.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein v is 1 and R₃ is F, optionally substituted —OCH₃, optionally substituted —CH₃, or optionally substituted cyclopropyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein R₄ is hydrogen or —C₁-C₃ alkyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein R₄ is hydrogen and R₅ is methyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein R₄ and R₅ are taken together with the carbon atom to which they are attached to form an optionally substituted —C₃-C₆ cycloalkyl.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein L is absent, —CONH—, or —NHCO—. In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein L is —CONH—.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein A is optionally substituted heteroaryl; preferably A is optionally substituted thiophenyl. When present the substituent or substituents are preferably independently selected from halogen, —CN, —OH, —NH₂, —NO₂, —CH₃, —CF₃, —OCH₃, —OCF₃, —SO₂CH₃, —CH₂N(CH₃)₂, and —C(O)CH₃. In preferred embodiments, there are 0 to 2 substituents and, more preferably, 0 or 1 substituent.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein A is optionally substituted aryl; preferably A is optionally substituted phenyl. The optional substituents are preferably independently selected from, but not limited to, halogen, —CN, —OH, —NH₂, —NO₂, —CH₃, —CF₃, —OCH₃, —OCF₃, —SO₂CH₃, —CH₂N(CH₃)₂, and —C(O)CH₃. In preferred embodiments, there are 0 to 2 substituents and, more preferably, 0 or 1 substituent.

In one embodiment, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein A is derived from one of the following by removal of two hydrogen atoms:

wherein each of the above is optionally substituted when possible. Preferably, when present, the substituents are independently selected from, but not limited to, —CN, —F, —Cl, —CH₃, —CF₃, —OCH₃, and —OCF₃.

In one embodiment, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein A is derived from one of the following:

wherein each of the above is optionally substituted. Preferably, when present, the substituents are independently selected from, but not limited to, —CN, —F, —Cl, —CH₃, —CF₃, —OCH₃, and —OCF₃.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein B is optionally substituted —C₃-C₁₂ cycloalkyl. When present the substituent or substituents are preferably independently selected from halogen, —CN, —OH, —NH₂, —NO₂, —CH₃, —CF₃, —OCH₃, —OCF₃, —SO₂CH₃, —CH₂N(CH₃)₂, and —C(O)CH₃. In preferred embodiments, there are 0 to 2 substituents and, more preferably, 0 or 1 substituent.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein B is optionally substituted aryl; preferably B is optionally substituted phenyl. The optional substituents are preferably independently selected from, but not limited to, halogen, —CN, —OH, —NH₂, —NO₂, —CH₃, —CF₃, —OCH₃, —OCF₃, —SO₂CH₃, —CH₂N(CH₃)₂, and —C(O)CH₃. In preferred embodiments, there are 0 to 2 substituents and, more preferably, 0 or 1 substituent.

In certain embodiments, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein B is optionally substituted heteroaryl. When present the substituent or substituents are preferably independently selected from halogen, —CN, —OH, —NH₂, —NO₂, —CH₃, —CF₃, —OCH₃, —OCF₃, —SO₂CH₃, —CH₂N(CH₃)₂, and —C(O)CH₃. In preferred embodiments, there are 0 to 2 substituents and, more preferably, 0 or 1 substituent.

In one embodiment, the present invention relates to compounds of Formula (I), and pharmaceutically acceptable salts, esters and prodrugs thereof, wherein B is derived from one of the following by removal of a hydrogen atom:

wherein each of the above is optionally substituted when possible. Preferably, when present, the substituents are independently selected from, but not limited to, —CN, —F, —Cl, —CH₃, —CF₃, —OCH₃, and —OCF₃.

In another embodiment, the invention provides a compound represented by Formula (I-a) or (I-b) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein A, L, B, Z₁, Z₂, Z₃, Z₄, R₂, R₃, R₄, R₅, m, and v are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (II-a)˜(II-c) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein A, B, Z₁, Z₂, Z₃, Z₄, R₂, R₃, R₄, R₅, m, and v are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (III-a)˜(II-c) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein A, B, Z₁, Z₂, Z₃, Z₄, R₃, R₄, R₅, and v are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (IV-a)˜(IV-c) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein A, B, Z₁, Z₂, Z₃, Z₄, R₃, R₄ and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (IV-a1)˜(IV-c1) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein A, B, Z₁, Z₂, Z₃, Z₄, R₃, R₄ and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (V-a)˜(V-c) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein A, B, R₃, R₄ and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (VI-a)˜(VI-c) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein A, B, R₃, R₄ and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (VII-a)˜(VII-c) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein A, B, R₃, R₄ and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (VIII-a)˜(VIII-f) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein B, R₃, R₄, and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (VIII-a1)˜(VIII-f1) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein B, R₃, R₄, and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (VIII-a2)˜(VIII-f2) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein B, R₃, and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (VIII-a)˜(VIII-f), (VIII-a1)˜(VIII-f1), and (VIII-a2)˜(VIII-f2), or a pharmaceutically acceptable salt, ester or prodrug thereof, wherein B is derived from one of the following by removal of a hydrogen atom:

wherein each of the above is optionally substituted when possible. Preferably, when present, the substituents are independently selected from, but not limited to, —CN, —F, —Cl, —CH₃, —CF₃, —OCH₃, and —OCF₃.

In another embodiment, the invention provides a compound represented by one of Formulas (IX-a)˜(IX-c) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein E₁, E₂, and E₃ are each of —O—, —C(R₁₁)(R₁₂)— or —N(R₁₁)—; R₁₁ and R₁₂ are each hydrogen or optionally substituted —C₁-C₃ alkyl; n is 0, 1, 2, or 3; and A, B, Z₁, Z₂, Z₃, Z₄, R₄, and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (X-a)˜(X-d) or a pharmaceutically acceptably salt, ester or prodrug thereof:

wherein A, B, Z₁, Z₂, Z₃, Z₄, R₄, and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (XI-a)˜(XI-f) or a pharmaceutically acceptably salt, ester or prodrug thereof:

wherein B, R₄, and R₅ are as previously defined.

In another embodiment, the invention provides a compound represented by one of Formulas (XII-a)˜(XII-f) or a pharmaceutically acceptable salt, ester or prodrug thereof:

wherein B, R₄, and R₅ are as previously defined.

It will be appreciated that the description of the present invention herein should be construed in congruity with the laws and principles of chemical bonding. In some instances, it may be necessary to remove a hydrogen atom to accommodate a substituent at any given location.

It is intended that the definition of any substituent or variable (e.g., R₁, R₂, etc.) at a particular location in a molecule be independent of its definitions elsewhere in that molecule.

It will be yet appreciated that the compounds of the present invention may contain one or more asymmetric carbon atoms and may exist in racemic, diastereoisomeric, and optically active forms. It will still be appreciated that certain compounds of the present invention may exist in different tautomeric forms. All tautomers are contemplated to be within the scope of the present invention.

In certain embodiments, the present invention provides a method for the prevention or treatment of RSV activities and for treating RSV infection in a subject in need thereof. The method comprises administering to the subject a therapeutically effective amount of a compound of formula (I).

The present invention also provides the use of a compound of formula (I) for the preparation of a medicament for the prevention or treatment of RSV.

Thus, in one embodiment, a compound of formula (I), or pharmaceutically acceptable salt thereof, is combined with a steroid anti-inflammatory compound, for example budesonide or fluticasone. In a preferred embodiment, the steroid is administered in low doses to minimize immuno-suppressant effects. In another embodiment a compound of formula (I), or a pharmaceutically acceptable salt thereof, is combined with a non-steroid anti-inflammatory compound, for example leukotriene antagonists such as Singulair (Merck) or Accolate (Astra Zeneca), phosphodiesterase 4 inhibitors such as roflumilast (Altana), TNF alpha inhibitors such as Enbrel (Amgen), Remicade (Centocor), Humira (Abbott) or CDP870 (Celltech) or NSAIDS. In a further embodiment, a compound of formula (I) is combined with interleukin 8 or interleukin 9 inhibitors. The present invention thus also relates to a product containing a compound of formula (I), or a pharmaceutically acceptable salt thereof, and an anti-inflammatory compound for simultaneous, separate, or sequential use in the treatment of RSV.

The present invention also relates to a combination of a compound of formula (I), or a pharmaceutically acceptable salt thereof, with an anti-influenza compound and the use of such a combination in the treatment of concomitant RSV and influenza infections. The present invention thus also relates to a product containing a compound of formula (I), or a pharmaceutically acceptable salt thereof, and an anti-influenza compound for simultaneous, separate or sequential use in the treatment of concomitant RSV and influenza infections. The compounds of the invention may be administered in a variety of dosage forms. Thus, they can be administered orally, for example as tablets, troches, lozenges, aqueous or oily suspensions, dispersible powders or granules. The compounds of the invention may also be administered parenterally, whether subcutaneously, intravenously, intramuscularly, intracisternally, transdermally or by infusion techniques. The compounds may also be administered as suppositories.

In an embodiment, the compounds of the invention are administered by intranasal or intrabronchial administration. The present invention also provides an inhaler or nebuliser containing a medicament which comprises (a) a benzodiazepine derivative of the formula (I), as defined above, or a pharmaceutically acceptable salt thereof, and (b) a pharmaceutically acceptable carrier or diluent.

The present invention also provides a pharmaceutical composition containing such a benzodiazepine derivative, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier or diluent.

The compounds of the invention are typically formulated for administration with a pharmaceutically acceptable carrier or diluent. For example, solid oral forms may contain, together with the active compound, diluents, e.g. lactose, dextrose, saccharose, cellulose, corn starch or potato starch; lubricants, e.g. silica, talc, stearic acid, magnesium or calcium stearate, and/or polyethylene glycols; binding agents; e.g. starches, arabic gums, gelatin, methylcellulose, carboxymethylcellulose or polyvinyl pyrrolidone; disaggregating agents, e.g. starch, alginic acid, alginates or sodium starch glycolate; effervescing mixtures; dyestuffs; sweeteners; wetting agents, such as lecithin, polysorbates, laurylsulfates; and, in general, non-toxic and pharmacologically inactive substances used in pharmaceutical formulations. Such pharmaceutical preparations may be manufactured in known manner, for example, by means of mixing, granulating, tableting, sugar coating, or film coating processes.

Liquid dispersions for oral administration may be syrups, emulsions and suspensions. The syrups may contain as carriers, for example, saccharose or saccharose with glycerine and/or mannitol and/or sorbitol.

Suspensions and emulsions may contain as carrier, for example a natural gum, agar, sodium alginate, pectin, methylcellulose, carboxymethylcellulose, or polyvinyl alcohol. The suspension or solutions for intramuscular injections may contain, together with the active compound, a pharmaceutically acceptable carrier, e.g., sterile water, olive oil, ethyl oleate, glycols, e.g. propylene glycol, and if desired, a suitable amount of lidocaine hydrochloride.

Solutions for injection or infusion may contain as carrier, for example, sterile water or preferably they may be in the form of sterile, aqueous, isotonic saline solutions.

The present invention also relates to the novel compounds, as defined above; or a pharmaceutically acceptable salt thereof, for use in a method of treating the human or animal body. The present invention also relates to a pharmaceutical composition comprising a novel compound as defined above and a pharmaceutically acceptable diluent or carrier. Preferably, the pharmaceutical composition comprises a pharmaceutically acceptable salt of a novel compound as defined above. A pharmaceutically acceptable salt is as defined above. The novel compounds of the invention are typically administered in the manner defined above and the compounds are typically formulated for administration in the manner defined above.

Preferably, the pharmaceutical compositions comprise optically active isomers of the novel compounds of the invention. Thus, for example, preferred novel compounds of the invention containing only one chiral center include an R enantiomer in substantially pure form, an S enantiomer in substantially pure form and enantiomeric mixtures which contain an excess of the R enantiomer or an excess of the S enantiomer. It is particularly preferred that pharmaceutical contains a compound of the invention which is a substantially pure optical isomer. For the avoidance of doubt, the novel compounds of the invention can, if desired, be used in the form of solvates.

Yet a further aspect of the present invention is a process of making any of the compounds delineated herein employing any of the synthetic means delineated herein.

Definitions

Listed below are definitions of various terms used to describe this invention. These definitions apply to the terms as they are used throughout this specification and claims, unless otherwise limited in specific instances, either individually or as part of a larger group.

The term “aryl,” as used herein, refers to a mono-, bi-, or polycyclic carbocyclic ring system comprising at least one aromatic ring, including, but not limited to, phenyl, naphthyl, tetrahydronaphthyl, indanyl, and indenyl. A polycyclic aryl is a polycyclic ring system that comprises at least one aromatic ring. Polycyclic aryls can comprise fused rings, covalently attached rings or a combination thereof.

The term “heteroaryl,” as used herein, refers to a mono-, bi-, or polycyclic aromatic radical having one or more ring atom selected from S, O and N; and the remaining ring atoms are carbon, wherein any N or S contained within the ring may be optionally oxidized. Heteroaryl includes, but is not limited to, pyridinyl, pyrazinyl, pyrimidinyl, pyrrolyl, pyrazolyl, imidazolyl, thiazolyl, oxazolyl, isoxazolyl, thiadiazolyl, oxadiazolyl, thiophenyl, furanyl, quinolinyl, isoquinolinyl, benzimidazolyl, benzoxazolyl, quinoxalinyl. A polycyclic heteroaryl can comprise fused rings, covalently attached rings or a combination thereof.

In accordance with the invention, aromatic groups can be substituted or unsubstituted.

The term “bicyclic aryl” or “bicyclic heteroaryl” refers to a ring system consisting of two rings wherein at least one ring is aromatic; and the two rings can be fused or covalently attached.

The term “alkyl” as used herein, refers to saturated, straight- or branched-chain hydrocarbon radicals. “C₁-C₃ alkyl”, “C₁-C₆ alkyl,” “C₁-C₁₀ alkyl” C₂-C₄ alkyl,” or “C₃-C₆ alkyl,” refer to alkyl groups containing from one to three, one to six, one to ten carbon atoms, 2 to 4 and 3 to 6 carbon atoms respectively. Examples of C₁-C₈ alkyl radicals include, but are not limited to, methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, neopentyl, n-hexyl, heptyl and octyl radicals.

The term “alkenyl” as used herein, refers to straight- or branched-chain hydrocarbon radicals having at least one carbon-carbon double bond by the removal of a single hydrogen atom. “C₂-C₁₀ alkenyl,” “C₂-C₈ alkenyl,” “C₂-C₄ alkenyl,” or “C₃-C₆ alkenyl,” refer to alkenyl groups containing from two to ten, two to eight, two to four or three to six carbon atoms respectively. Alkenyl groups include, but are not limited to, for example, ethenyl, propenyl, butenyl, 1-methyl-2-buten-1-yl, heptenyl, octenyl, and the like.

The term “alkynyl” as used herein, refers to straight- or branched-chain hydrocarbon radicals having at least one carbon-carbon triple bond by the removal of a single hydrogen atom. “C₂-C₁₀ alkynyl,” “C₂-C₈ alkynyl,” “C₂-C₄ alkynyl,” or “C₃-C₆ alkynyl,” refer to alkynyl groups containing from two to ten, two to eight, two to four or three to six carbon atoms respectively. Representative alkynyl groups include, but are not limited to, for example, ethynyl, 1-propynyl, 1-butynyl, heptynyl, octynyl, and the like.

The term “cycloalkyl”, as used herein, refers to a monocyclic or polycyclic saturated carbocyclic ring or a bi- or tri-cyclic group fused, bridged or spiro system, and the carbon atoms may be optionally oxo-substituted or optionally substituted with exocyclic olefinic, imidic or oxamic double bond. Preferred cycloalkyl groups include C₃-C₁₂ cycloalkyl, C₃-C₆ cycloalkyl, C₃-C₈ cycloalkyl and C₄-C₇ cycloalkyl. Examples of C₃-C₁₂ cycloalkyl include, but not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclopentyl, cyclooctyl, 4-methylene-cyclohexyl, bicyclo[2.2.1]heptyl, bicyclo[3.1.0]hexyl, spiro[2.5]octyl, 3-methylenebicyclo[3.2.1]octyl, spiro[4.4]nonanyl, and the like.

The term “cycloalkenyl”, as used herein, refers to monocyclic or polycyclic carbocyclic ring or a bi- or tri-cyclic group fused, bridged or spiro system having at least one carbon-carbon double bond and the carbon atoms may be optionally oxo-substituted or optionally substituted with exocyclic olefinic, imidic or oxamic double bond. Preferred cycloalkenyl groups include C₃-C₁₂ cycloalkenyl, C₃-C₈ cycloalkenyl or C₅-C₇ cycloalkenyl groups. Examples of C₃-C₁₂ cycloalkenyl include, but not limited to, cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclooctenyl, bicyclo[2.2.1]hept-2-enyl, bicyclo[3.1.0]hex-2-enyl, spiro[2.5]oct-4-enyl, spiro[4.4]non-1-enyl, bicyclo[4.2.1]non-3-en-9-yl, and the like.

As used herein, the term “arylalkyl” means a functional group wherein an alkylene chain is attached to an aryl group, e.g., —CH₂CH₂-phenyl. The term “substituted arylalkyl” means an arylalkyl functional group in which the aryl group is substituted. Similarly, the term “heteroarylalkyl” means a functional group wherein an alkylene chain is attached to a heteroaryl group. The term “substituted heteroarylalkyl” means a heteroarylalkyl functional group in which the heteroaryl group is substituted.

As used herein, the term “alkoxy” employed alone or in combination with other terms means, unless otherwise stated, an alkyl group having the designated number of carbon atoms connected to the rest of the molecule via an oxygen atom, such as, for example, methoxy, ethoxy, 1-propoxy, 2-propoxy (isopropoxy) and the higher homologs and isomers. Preferred alkoxy are (C₁-C₃) alkoxy.

It is understood that any alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclic and cycloalkenyl moiety described herein can also be an aliphatic group or an alicyclic group.

An “aliphatic” group is a non-aromatic moiety comprised of any combination of carbon atoms, hydrogen atoms, halogen atoms, oxygen, nitrogen or other atoms, and optionally contains one or more units of unsaturation, e.g., double and/or triple bonds. Examples of aliphatic groups are functional groups, such as alkyl, alkenyl, alkynyl, O, OH, NH, NH₂, C(O), S(O)₂, C(O)O, C(O)NH, OC(O)O, OC(O)NH, OC(O)NH₂, S(O)₂NH, S(O)₂NH₂, NHC(O)NH₂, NHC(O)C(O)NH, NHS(O)₂NH, NHS(O)₂NH₂, C(O)NHS(O)₂, C(O)NHS(O)₂NH or C(O)NHS(O)₂NH₂, and the like, groups comprising one or more functional groups, non-aromatic hydrocarbons (optionally substituted), and groups wherein one or more carbons of a non-aromatic hydrocarbon (optionally substituted) is replaced by a functional group. Carbon atoms of an aliphatic group can be optionally oxo-substituted. An aliphatic group may be straight chained, branched, cyclic, or a combination thereof and preferably contains between about 1 and about 24 carbon atoms, more typically between about 1 and about 12 carbon atoms. In addition to aliphatic hydrocarbon groups, as used herein, aliphatic groups expressly include, for example, alkoxyalkyls, polyalkoxyalkyls, such as polyalkylene glycols, polyamines, and polyimines, for example. Aliphatic groups may be optionally substituted.

The terms “heterocyclic” or “heterocycloalkyl” can be used interchangeably and referred to a non-aromatic ring or a bi- or tri-cyclic group fused, bridged or spiro system, where (i) each ring system contains at least one heteroatom independently selected from oxygen, sulfur and nitrogen, (ii) each ring system can be saturated or unsaturated (iii) the nitrogen and sulfur heteroatoms may optionally be oxidized, (iv) the nitrogen heteroatom may optionally be quaternized, (v) any of the above rings may be fused to an aromatic ring, and (vi) the remaining ring atoms are carbon atoms which may be optionally oxo-substituted or optionally substituted with exocyclic olefinic, imidic or oxamic double bond. Representative heterocycloalkyl groups include, but are not limited to, 1,3-dioxolane, pyrrolidinyl, pyrazolinyl, pyrazolidinyl, imidazolinyl, imidazolidinyl, piperidinyl, piperazinyl, oxazolidinyl, isoxazolidinyl, morpholinyl, thiazolidinyl, isothiazolidinyl, quinoxalinyl, pyridazinonyl, 2-azabicyclo[2.2.1]-heptyl, 8-azabicyclo[3.2.1]octyl, 5-azaspiro[2.5]octyl, 1-oxa-7-azaspiro[4.4]nonanyl, 7-oxooxepan-4-yl, and tetrahydrofuryl. Such heterocyclic groups may be further substituted. Heteroaryl or heterocyclic groups can be C-attached or N-attached (where possible).

It is understood that any alkyl, alkenyl, alkynyl, alicyclic, cycloalkyl, cycloalkenyl, aryl, heteroaryl, heterocyclic, aliphatic moiety or the like, described herein can also be a divalent or multivalent group when used as a linkage to connect two or more groups or substituents, which can be at the same or different atom(s). One of skill in the art can readily determine the valence of any such group from the context in which it occurs.

The term “substituted” refers to substitution by independent replacement of one, two, or three or more of the hydrogen atoms with substituents including, but not limited to, —F, —Cl, —Br, —I, —OH, C₁-C₁₂-alkyl; C₂-C₁₂-alkenyl, C₂-C₁₂-alkynyl, —C₃-C₁₂-cycloalkyl, protected hydroxy, —NO₂, —N₃, —CN, —NH₂, protected amino, oxo, thioxo, —NH—C₁-C₁₂-alkyl, —NH—C₂-C₈-alkenyl, —NH—C₂-C₈-alkynyl, —NH—C₃-C₁₂-cycloalkyl, —NH-aryl, —NH-heteroaryl, —NH-heterocycloalkyl, -dialkylamino, -diarylamino,-diheteroarylamino, —O—C₁-C₁₂-alkyl, —O—C₂-C₈-alkenyl, —O—C₂-C₈-alkynyl, —O—C₃-C₁₂-cycloalkyl, —O-aryl, —O-heteroaryl, —O-heterocycloalkyl, —C(O)—C₁-C₁₂-alkyl, —C(O)—C₂-C₈-alkenyl, —C(O)—C₂-C₈-alkynyl, —C(O)—C₃-C₁₂-cycloalkyl, —C(O)-aryl, —C(O)-heteroaryl, —C(O)-heterocycloalkyl, —CONH₂, —CONH—C₁-C₁₂-alkyl, —CONH—C₂-C₈-alkenyl, —CONH—C₂-C₈-alkynyl, —CONH—C₃-C₁₂-cycloalkyl, —CONH-aryl, —CONH-heteroaryl, —CONH-heterocycloalkyl, —OCO₂—C₁-C₁₂-alkyl, —OCO₂—C₂-C₈-alkenyl, —OCO₂—C₂-C₈-alkynyl, —OCO₂—C₃-C₁₂-cycloalkyl, —OCO₂-aryl, —OCO₂-heteroaryl, —OCO₂-heterocycloalkyl, —CO₂—C₁-C₁₂ alkyl, —CO₂—C₂-C₈ alkenyl, —CO₂—C₂-C₈ alkynyl, CO₂—C₃-C₁₂-cycloalkyl, —CO₂-aryl, CO₂-heteroaryl, CO₂-heterocycloalkyl, —OCONH₂, —OCONH—C₁-C₁₂-alkyl, —OCONH—C₂-C₈-alkenyl, —OCONH—C₂-C₈-alkynyl, —OCONH—C₃-C₁₂-cycloalkyl, —OCONH-aryl, —OCONH-heteroaryl, —OCONH-heterocyclo-alkyl, —NHC(O)H, —NHC(O)—C₁-C₁₂-alkyl, —NHC(O)—C₂-C₈-alkenyl, —NHC(O)—C₂-C₈-alkynyl, —NHC(O)—C₃-C₁₂-cycloalkyl, —NHC(O)-aryl, —NHC(O)-heteroaryl, —NHC(O)-heterocyclo-alkyl, —NHCO₂—C₁-C₁₂-alkyl, —NHCO₂—C₂-C₈-alkenyl, —NHCO₂—C₂-C₈-alkynyl, —NHCO₂—C₃-C₁₂-cycloalkyl, —NHCO₂-aryl, —NHCO₂-heteroaryl, —NHCO₂-heterocycloalkyl, —NHC(O)NH₂, —NHC(O)NH—C₁-C₁₂-alkyl, —NHC(O)NH—C₂-C₈-alkenyl, —NHC(O)NH—C₂-C₈-alkynyl, —NHC(O)NH—C₃-C₁₂-cycloalkyl, —NHC(O)NH-aryl, —NHC(O)NH-heteroaryl, —NHC(O)NH-heterocycloalkyl, NHC(S)NH₂, —NHC(S)NH—C₁-C₁₂-alkyl, —NHC(S)NH—C₂-C₈-alkenyl, —NHC(S)NH—C₂-C₈-alkynyl, —NHC(S)NH—C₃-C₁₂-cycloalkyl, —NHC(S)NH-aryl, —NHC(S)NH-heteroaryl, —NHC(S)NH-heterocycloalkyl, —NHC(NH)NH₂, —NHC(NH)NH—C₁-C₁₂-alkyl, —NHC(NH)NH—C₂-C₈-alkenyl, —NHC(NH)NH—C₂-C₈-alkynyl, —NHC(NH)NH—C₃-C₁₂-cycloalkyl, —NHC(NH)NH-aryl, —NHC(NH)NH-heteroaryl, —NHC(NH)NH-heterocycloalkyl, —NHC(NH)—C₁-C₁₂-alkyl, —NHC(NH)—C₂-C₈-alkenyl, —NHC(NH)—C₂-C₈-alkynyl, —NHC(NH)—C₃-C₁₂-cycloalkyl, —NHC(NH)-aryl, —NHC(NH)-heteroaryl, —NHC(NH)-heterocycloalkyl, —C(NH)NH—C₁-C₁₂-alkyl, —C(NH)NH—C₂-C₈-alkenyl, —C(NH)NH—C₂-C₈-alkynyl, —C(NH)NH—C₃-C₁₂-cycloalkyl, —C(NH)NH-aryl, —C(NH)NH-heteroaryl, —C(NH)NH-heterocycloalkyl, —S(O)—C₁-C₁₂-alkyl, —S(O)—C₂-C₈-alkenyl, —S(O)—C₂-C₈-alkynyl, —S(O)—C₃-C₁₂-cycloalkyl, —S(O)-aryl, —S(O)-heteroaryl, —S(O)-heterocycloalkyl, —SO₂NH₂, —SO₂NH—C₁-C₁₂-alkyl, —SO₂NH—C₂-C₈-alkenyl, —SO₂NH—C₂-C₈-alkynyl, —SO₂NH—C₃-C₁₂-cycloalkyl, —SO₂NH-aryl, —SO₂NH-heteroaryl, —SO₂NH-heterocycloalkyl, —NHSO₂—C₁-C₁₂-alkyl, —NHSO₂—C₂-C₈-alkenyl, —NHSO₂—C₂-C₈-alkynyl, —NHSO₂—C₃-C₁₂-cycloalkyl, —NHSO₂-aryl, —NHSO₂-heteroaryl, —NHSO₂-heterocycloalkyl, —CH₂NH₂, —CH₂SO₂CH₃, -aryl, -arylalkyl, -heteroaryl, -heteroarylalkyl, -heterocycloalkyl, —C₃-C₁₂-cycloalkyl, polyalkoxyalkyl, polyalkoxy, -methoxymethoxy, -methoxyethoxy, —SH, —S—C₁-C₁₂-alkyl, —S—C₂-C₈-alkenyl, —S—C₂-C₈-alkynyl, —S—C₃-C₁₂-cycloalkyl, —S-aryl, —S-heteroaryl, —S-heterocycloalkyl, or methylthio-methyl. In certain embodiments, the substituents are independently selected from halo, preferably Cl and F; C₁-C₄-alkyl, preferably methyl and ethyl; halo-C₁-C₄-alkyl, such as fluoromethyl, difluoromethyl, and trifluoromethyl; C₂-C₄-alkenyl; halo-C₂-C₄-alkenyl; C₃-C₆-cycloalkyl, such as cyclopropyl; C₁-C₄-alkoxy, such as methoxy and ethoxy; halo-C₁-C₄-alkoxy, such as fluoromethoxy, difluoromethoxy, and trifluoromethoxy, —CN; —OH; NH₂; C₁-C₄-alkylamino; di(C₁-C₄-alkyl)amino; and NO₂. It is understood that the aryls, heteroaryls, alkyls, and the like can be further substituted. In some cases, each substituent in a substituted moiety is additionally optionally substituted when possible with one or more groups, each group being independently selected from C₁-C₄-alkyl; —CF₃, —OCH₃, —OCF₃, —F, —Cl, —Br, —I, —OH, —NO₂, —CN, and —NH₂. Preferably, a substituted alkyl group, such as a substituted methyl group, is substituted with one or more halogen atoms, more preferably one or more fluorine or chlorine atoms.

In certain embodiments, a substituted alkyl, alkenyl or alkoxy group is substituted with one or more halogen atoms, preferably fluorine atoms. Such substituted alkyl groups include fluoromethyl, difluoromethyl and trifluoromethyl. Such substituted alkoxy groups include fluoromethoxy, difluoromethoxy and trifluoromethoxy.

The term “halo” or halogen” alone or as part of another substituent, as used herein, refers to a fluorine, chlorine, bromine, or iodine atom.

The term “optionally substituted”, as used herein, means that the referenced group may be substituted or unsubstituted. In one embodiment, the referenced group is optionally substituted with zero substituents, i.e., the referenced group is unsubstituted. In another embodiment, the referenced group is optionally substituted with one or more additional group(s) individually and independently selected from groups described herein.

The term “hydrogen” includes hydrogen and deuterium. In addition, the recitation of an atom includes other isotopes of that atom so long as the resulting compound is pharmaceutically acceptable.

In certain embodiments, the compounds of each formula herein are defined to include isotopically labelled compounds. An “isotopically labelled compound” is a compound in which at least one atomic position is enriched in a specific isotope of the designated element to a level which is significantly greater than the natural abundance of that isotope. For example, one or more hydrogen atom positions in a compound can be enriched with deuterium to a level which is significantly greater than the natural abundance of deuterium, for example, enrichment to a level of at least 1%, preferably at least 20% or at least 50%. Such a deuterated compound may, for example, be metabolized more slowly than its non-deuterated analog, and therefore exhibit a longer half-life when administered to a subject. Such compounds can synthesize using methods known in the art, for example by employing deuterated starting materials. Unless stated to the contrary, isotopically labelled compounds are pharmaceutically acceptable.

The term “hydroxy activating group,” as used herein, refers to a labile chemical moiety which is known in the art to activate a hydroxyl group so that it will depart during synthetic procedures such as in a substitution or an elimination reaction. Examples of hydroxyl activating group include, but are not limited to, mesylate, tosylate, triflate, p-nitrobenzoate, phosphonate and the like.

The term “activated hydroxyl,” as used herein, refers to a hydroxy group activated with a hydroxyl activating group, as defined above, including mesylate, tosylate, triflate, p-nitrobenzoate, phosphonate groups, for example.

The term “hydroxy protecting group,” as used herein, refers to a labile chemical moiety which is known in the art to protect a hydroxyl group against undesired reactions during synthetic procedures. After said synthetic procedure(s) the hydroxy protecting group as described herein may be selectively removed. Hydroxy protecting groups as known in the art are described generally in T. H. Greene and P. G. M. Wuts, Protective Groups in Organic Synthesis, 3rd edition, John Wiley & Sons, New York (1999). Examples of hydroxyl protecting groups include benzyloxycarbonyl, 4-methoxybenzyloxycarbonyl, tert-butoxy-carbonyl, isopropoxycarbonyl, diphenylmethoxycarbonyl, 2,2,2-trichloroethoxycarbonyl, allyloxycarbonyl, acetyl, formyl, chloroacetyl, trifluoroacetyl, methoxyacetyl, phenoxyacetyl, benzoyl, methyl, t-butyl, 2,2,2-trichloroethyl, 2-trimethylsilyl ethyl, allyl, benzyl, triphenyl-methyl (trityl), methoxymethyl, methylthiomethyl, benzyloxymethyl, 2-(trimethylsilyl)-ethoxymethyl, methanesulfonyl, trimethylsilyl, triisopropylsilyl, and the like.

The term “protected hydroxy,” as used herein, refers to a hydroxy group protected with a hydroxy protecting group, as defined above, including benzoyl, acetyl, trimethylsilyl, triethylsilyl, methoxymethyl groups, for example.

The term “hydroxy prodrug group,” as used herein, refers to a promoiety group which is known in the art to change the physicochemical, and hence the biological properties of a parent drug in a transient manner by covering or masking the hydroxy group. After said synthetic procedure(s), the hydroxy prodrug group as described herein must be capable of reverting back to hydroxy group in vivo. Hydroxy prodrug groups as known in the art are described generally in Kenneth B. Sloan, Prodrugs, Topical and Ocular Drug Delivery, (Drugs and the Pharmaceutical Sciences; Volume 53), Marcel Dekker, Inc., New York (1992) and in “Prodrugs of Alcohols and Phenols” by S. S. Dhareshwar and V. J. Stella, in Prodrugs Challenges and Rewards Part-2, (Biotechnology: Pharmaceutical Aspects), edited by V. J. Stella, et al, Springer and AAPSPress, 2007, pp 31-99.

The term “amino protecting group,” as used herein, refers to a labile chemical moiety which is known in the art to protect an amino group against undesired reactions during synthetic procedures. After said synthetic procedure(s) the amino protecting group as described herein may be selectively removed. Amino protecting groups as known in the art are described generally in T. H. Greene and P. G. M. Wuts, Protective Groups in Organic Synthesis, 3rd edition, John Wiley & Sons, New York (1999). Examples of amino protecting groups include, but are not limited to, methoxycarbonyl, t-butoxycarbonyl, 9-fluorenyl-methoxycarbonyl, benzyloxycarbonyl, and the like.

The term “protected amino,” as used herein, refers to an amino group protected with an amino protecting group as defined above.

The term “leaving group” means a functional group or atom which can be displaced by another functional group or atom in a substitution reaction, such as a nucleophilic substitution reaction. By way of example, representative leaving groups include chloro, bromo and iodo groups; sulfonic ester groups, such as mesylate, tosylate, brosylate, nosylate and the like; and acyloxy groups, such as acetoxy, trifluoroacetoxy and the like.

The term “aprotic solvent,” as used herein, refers to a solvent that is relatively inert to proton activity, i.e., not acting as a proton-donor. Examples include, but are not limited to, hydrocarbons, such as hexane and toluene, for example, halogenated hydrocarbons, such as, for example, methylene chloride, ethylene chloride, chloroform, and the like, heterocyclic compounds, such as, for example, tetrahydrofuran and N-methylpyrrolidinone, and ethers such as diethyl ether, bis-methoxymethyl ether. Such compounds are well known to those skilled in the art, and it will be obvious to those skilled in the art that individual solvents or mixtures thereof may be preferred for specific compounds and reaction conditions, depending upon such factors as the solubility of reagents, reactivity of reagents and preferred temperature ranges, for example. Further discussions of aprotic solvents may be found in organic chemistry textbooks or in specialized monographs, for example: Organic Solvents Physical Properties and Methods of Purification, 4th ed., edited by John A. Riddick et al., Vol. II, in the Techniques of Chemistry Series, John Wiley & Sons, NY, 1986.

The term “protic solvent,” as used herein, refers to a solvent that tends to provide protons, such as an alcohol, for example, methanol, ethanol, propanol, isopropanol, butanol, t-butanol, and the like. Such solvents are well known to those skilled in the art, and it will be obvious to those skilled in the art that individual solvents or mixtures thereof may be preferred for specific compounds and reaction conditions, depending upon such factors as the solubility of reagents, reactivity of reagents and preferred temperature ranges, for example. Further discussions of protogenic solvents may be found in organic chemistry textbooks or in specialized monographs, for example: Organic Solvents Physical Properties and Methods of Purification, 4th ed., edited by John A. Riddick et al., Vol. II, in the Techniques of Chemistry Series, John Wiley & Sons, NY, 1986.

Combinations of substituents and variables envisioned by this invention are only those that result in the formation of stable compounds. The term “stable,” as used herein, refers to compounds which possess stability sufficient to allow manufacture and which maintains the integrity of the compound for a sufficient period of time to be useful for the purposes detailed herein (e.g., therapeutic or prophylactic administration to a subject).

The synthesized compounds can be separated from a reaction mixture and further purified by a method such as column chromatography, high pressure liquid chromatography, or recrystallization. As can be appreciated by the skilled artisan, further methods of synthesizing the compounds of the Formula herein will be evident to those of ordinary skill in the art. Additionally, the various synthetic steps may be performed in an alternate sequence or order to give the desired compounds. Synthetic chemistry transformations and protecting group methodologies (protection and deprotection) useful in synthesizing the compounds described herein are known in the art and include, for example, those such as described in R. Larock, Comprehensive Organic Transformations, 2^(nd) Ed. Wiley-VCH (1999); T. W. Greene and P. G. M. Wuts, Protective Groups in Organic Synthesis, 3rd Ed., John Wiley and Sons (1999); L. Fieser and M. Fieser, Fieser and Fieser's Reagents for Organic Synthesis, John Wiley and Sons (1994); and L. Paquette, ed., Encyclopedia of Reagents for Organic Synthesis, John Wiley and Sons (1995), and subsequent editions thereof.

The term “subject,” as used herein, refers to an animal. Preferably, the animal is a mammal. More preferably, the mammal is a human. A subject also refers to, for example, dogs, cats, horses, cows, pigs, guinea pigs, fish, birds and the like.

The compounds of this invention may be modified by appending appropriate functionalities to enhance selective biological properties. Such modifications are known in the art and may include those which increase biological penetration into a given biological system (e.g., blood, lymphatic system, central nervous system), increase oral availability, increase solubility to allow administration by injection, alter metabolism and alter rate of excretion.

The compounds described herein contain one or more asymmetric centers and thus give rise to enantiomers, diastereomers, and other stereoisomeric forms that may be defined, in terms of absolute stereochemistry, as (R)- or (S)-, or as (D)- or (L)- for amino acids. The present invention is meant to include all such possible isomers, as well as their racemic and optically pure forms. Optical isomers may be prepared from their respective optically active precursors by the procedures described above, or by resolving the racemic mixtures. The resolution can be carried out in the presence of a resolving agent, by chromatography or by repeated crystallization or by some combination of these techniques which are known to those skilled in the art. Further details regarding resolutions can be found in Jacques, et al., Enantiomers, Racemates, and Resolutions (John Wiley & Sons, 1981). When the compounds described herein contain olefinic double bonds, other unsaturation, or other centers of geometric asymmetry, and unless specified otherwise, it is intended that the compounds include both E and Z geometric isomers or cis- and trans-isomers. Likewise, all tautomeric forms are also intended to be included. Tautomers may be in cyclic or acyclic. The configuration of any carbon-carbon double bond appearing herein is selected for convenience only and is not intended to designate a particular configuration unless the text so states; thus a carbon-carbon double bond or carbon-heteroatom double bond depicted arbitrarily herein as trans may be cis, trans, or a mixture of the two in any proportion.

Certain compounds of the present invention may also exist in different stable conformational forms which may be separable. Torsional asymmetry due to restricted rotation about an asymmetric single bond, for example because of steric hindrance or ring strain, may permit separation of different conformers. The present invention includes each conformational isomer of these compounds and mixtures thereof.

As used herein, the term “pharmaceutically acceptable salt,” refers to those salts which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and lower animals without undue toxicity, irritation, allergic response and the like, and are commensurate with a reasonable benefit/risk ratio. Pharmaceutically acceptable salts are well known in the art. For example, S. M. Berge, et al. describes pharmaceutically acceptable salts in detail in J. Pharmaceutical Sciences, 66: 1-19 (1977). The salts can be prepared in situ during the final isolation and purification of the compounds of the invention, or separately by reacting the free base function with a suitable organic acid. Examples of pharmaceutically acceptable salts include, but are not limited to, nontoxic acid addition salts are salts of an amino group formed with inorganic acids such as hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid and perchloric acid or with organic acids such as acetic acid, maleic acid, tartaric acid, citric acid, succinic acid or malonic acid or by using other methods used in the art such as ion exchange. Other pharmaceutically acceptable salts include, but are not limited to, adipate, alginate, ascorbate, aspartate, benzenesulfonate, benzoate, bisulfate, borate, butyrate, camphorate, camphorsulfonate, citrate, cyclopentane-propionate, digluconate, dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate, glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate, hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, laurate, lauryl sulfate, malate, maleate, malonate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate, pamoate, pectinate, persulfate, 3-phenylpropionate, phosphate, picrate, pivalate, propionate, stearate, succinate, sulfate, tartrate, thiocyanate, p-toluenesulfonate, undecanoate, valerate salts, and the like. Representative alkali or alkaline earth metal salts include sodium, lithium, potassium, calcium, magnesium, and the like. Further pharmaceutically acceptable salts include, when appropriate, nontoxic ammonium, quaternary ammonium, and amine cations formed using counterions such as halide, hydroxide, carboxylate, sulfate, phosphate, nitrate, alkyl having from 1 to 6 carbon atoms, sulfonate and aryl sulfonate.

Pharmaceutically acceptable salts can also be prepared by deprotonation of the parent compound with a suitable base, thereby forming the anionic conjugate base of the parent compound. In such salts the counter ion is a cation. Suitable cations include ammonium and metal cations, such as alkali metal cations, including Li⁺, Na⁺, K⁺ and Cs⁺, and alkaline earth metal cations, such as Mg²⁺ and Ca²⁺.

As used herein, the term “pharmaceutically acceptable ester” refers to esters which hydrolyze in vivo and include those that break down readily in the human body to leave the parent compound or a salt thereof. Suitable ester groups include, for example, those derived from pharmaceutically acceptable aliphatic carboxylic acids, particularly alkanoic, alkenoic, cycloalkanoic and alkanedioic acids, in which each alkyl or alkenyl moiety advantageously has not more than 6 carbon atoms. Examples of particular esters include, but are not limited to, esters of C₁-C₆-alkanoic acids, such as acetate, propionate, butyrate and pivalate esters.

In certain embodiments, the invention provides pharmaceutically acceptable prodrugs of the compounds disclosed herein. The term “pharmaceutically acceptable prodrugs” as used herein refers to those prodrugs of the compounds formed by the process of the present invention which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and lower animals with undue toxicity, irritation, allergic response, and the like, commensurate with a reasonable benefit/risk ratio, and effective for their intended use, as well as the zwitterionic forms, where possible, of the compounds of the present invention. “Prodrug”, as used herein means a compound, which is convertible in vivo by metabolic means (e.g. by hydrolysis) to afford any compound delineated by the formulae of the instant invention. Various forms of prodrugs are known in the art, for example, as discussed in Bundgaard, (ed.), Design of Prodrugs, Elsevier (1985); Widder, et al. (ed.), Methods in Enzymology, Vol. 4, Academic Press (1985); Krogsgaard-Larsen, et al., (ed.). “Design and Application of Prodrugs, Textbook of Drug Design and Development, Chapter 5, 113-191 (1991); Bundgaard, et al., Journal of Drug Deliver Reviews, 8:1-38(1992); Bundgaard, J. of Pharmaceutical Sciences, 77:285 et seq. (1988); Higuchi and Stella (eds.) Prodrugs as Novel Drug Delivery Systems, American Chemical Society (1975); and Bernard Testa & Joachim Mayer, “Hydrolysis In Drug And Prodrug Metabolism: Chemistry, Biochemistry And Enzymology,” John Wiley and Sons, Ltd. (2002).

Additional types of prodrugs are also encompassed. For instance, free carboxyl groups can be derivatized as amides or alkyl esters. Free hydroxy groups may be derivatized using groups including but not limited to hemisuccinates, ethyl succinate, phosphate esters, dimethylaminoacetates, and phosphoryloxymethyloxycarbonyls, as outlined in Advanced Drug Delivery Reviews, 1996, 19, 115. Carbamate prodrugs of hydroxy and amino groups are also included, as are carbonate prodrugs, sulfonate esters and sulfate esters of hydroxy groups. Derivatization of hydroxy groups as (acyloxy)methyl and (acyloxy)ethyl ethers wherein the acyl group may be an alkyl ester, optionally substituted with groups including but not limited to ether, amine and carboxylic acid functionalities, or where the acyl group is an amino acid ester as described above, are also encompassed. Prodrugs of this type are described in J. Med. Chem. 1996, 39, 10. Free amines can also be derivatized as amides, sulfonamides or phosphonamides. All of these prodrug moieties may incorporate groups including but not limited to ether, amine and carboxylic acid functionalities. In certain embodiments, a compound of the invention can incorporate two or more groups that are metabolically removed in vivo to yield the active parent compound. For example, a compound of formula I wherein R₁ is an amino acid residue can also be esterified, for example at a hydroxyl group of the sugar residue, to form a compound with two groups that can be removed in vivo to yield the active compound.

The term “treating”, as used herein, means relieving, lessening, reducing, eliminating, modulating, or ameliorating, i.e. causing regression of the disease state or condition. Treating can also include inhibiting, i.e. arresting the development, of an existing disease state or condition, and relieving or ameliorating, i.e. causing regression of an existing disease state or condition, for example when the disease state or condition may already be present.

The term “preventing”, as used herein means, to completely or almost completely stop a disease state or condition, from occurring in a patient or subject, especially when the patient or subject is predisposed to such or at risk of contracting a disease state or condition.

Additionally, the compounds of the present invention, for example, the salts of the compounds, can exist in either hydrated or unhydrated (the anhydrous) form or as solvates with other solvent molecules. Nonlimiting examples of hydrates include monohydrates, dihydrates, etc. Nonlimiting examples of solvates include ethanol solvates, acetone solvates, etc. “Solvates” means solvent addition forms that contain either stoichiometric or non stoichiometric amounts of solvent. Some compounds tend to trap a fixed molar ratio of solvent molecules in the crystalline solid state, thus forming a solvate. If the solvent is water the solvate formed is a hydrate, when the solvent is alcohol, the solvate formed is an alcoholate. Hydrates are formed by the combination of one or more molecules of water with one of the substances in which the water retains its molecular state as H₂O, such combination being able to form one or more hydrate.

As used herein, the term “analog” refers to a chemical compound that is structurally similar to another but differs slightly in composition (as in the replacement of one atom by an atom of a different element or in the presence of a particular functional group, or the replacement of one functional group by another functional group). Thus, an analog is a compound that is similar to or comparable in function and appearance to the reference compound.

The term “aprotic solvent,” as used herein, refers to a solvent that is relatively inert to proton activity, i.e., not acting as a proton-donor. Examples include, but are not limited to, hydrocarbons, such as hexane and toluene, for example, halogenated hydrocarbons, such as, for example, methylene chloride, ethylene chloride, chloroform, and the like, heterocyclic compounds, such as, for example, tetrahydrofuran and N-methylpyrrolidinone, and ethers such as diethyl ether, bis-methoxymethyl ether. Such solvents are well known to those skilled in the art, and individual solvents or mixtures thereof may be preferred for specific compounds and reaction conditions, depending upon such factors as the solubility of reagents, reactivity of reagents and preferred temperature ranges, for example. Further discussions of aprotic solvents may be found in organic chemistry textbooks or in specialized monographs, for example: Organic Solvents Physical Properties and Methods of Purification, 4th ed., edited by John A. Riddick et al., Vol. II, in the Techniques of Chemistry Series, John Wiley & Sons, NY, 1986.

The terms “protogenic organic solvent” or “protic solvent” as used herein, refer to a solvent that tends to provide protons, such as an alcohol, for example, methanol, ethanol, propanol, isopropanol, butanol, t-butanol, and the like. Such solvents are well known to those skilled in the art, and individual solvents or mixtures thereof may be preferred for specific compounds and reaction conditions, depending upon such factors as the solubility of reagents, reactivity of reagents and preferred temperature ranges, for example. Further discussions of protogenic solvents may be found in organic chemistry textbooks or in specialized monographs, for example: Organic Solvents Physical Properties and Methods of Purification, 4th ed., edited by John A. Riddick et al., Vol. II, in the Techniques of Chemistry Series, John Wiley & Sons, NY, 1986.

Combinations of substituents and variables envisioned by this invention are only those that result in the formation of stable compounds. The term “stable”, as used herein, refers to compounds which possess stability sufficient to allow manufacture and which maintains the integrity of the compound for a sufficient time to be useful for the purposes detailed herein (e.g., therapeutic or prophylactic administration to a subject).

The synthesized compounds can be separated from a reaction mixture and further purified by a method such as column chromatography, high pressure liquid chromatography, or recrystallization. Additionally, the various synthetic steps may be performed in an alternate sequence or order to give the desired compounds. In addition, the solvents, temperatures, reaction durations, etc. delineated herein are for purposes of illustration only and variation of the reaction conditions can produce the desired bridged macrocyclic products of the present invention. Synthetic chemistry transformations and protecting group methodologies (protection and deprotection) useful in synthesizing the compounds described herein include, for example, those described in R. Larock, Comprehensive Organic Transformations, VCH Publishers (1989); T. W. Greene and P. G. M. Wuts, Protective Groups in Organic Synthesis, 2d. Ed., John Wiley and Sons (1991); L. Fieser and M. Fieser, Fieser and Fieser's Reagents for Organic Synthesis, John Wiley and Sons (1994); and L. Paquette, ed., Encyclopedia of Reagents for Organic Synthesis, John Wiley and Sons (1995).

The compounds of this invention may be modified by appending various functionalities via synthetic means delineated herein to enhance selective biological properties. Such modifications include those which increase biological penetration into a given biological system (e.g., blood, lymphatic system, central nervous system), increase oral availability, increase solubility to allow administration by injection, alter metabolism and alter rate of excretion.

Pharmaceutical Compositions

The pharmaceutical compositions of the present invention comprise a therapeutically effective amount of a compound of the present invention formulated together with one or more pharmaceutically acceptable carriers. As used herein, the term “pharmaceutically acceptable carrier” means a non-toxic, inert solid, semi-solid or liquid filler, diluent, encapsulating material or formulation auxiliary of any type. Some examples of materials which can serve as pharmaceutically acceptable carriers are sugars such as lactose, glucose and sucrose; starches such as corn starch and potato starch; cellulose and its derivatives such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt; gelatin; talc; excipients such as cocoa butter and suppository waxes; oils such as peanut oil, cottonseed oil; safflower oil; sesame oil; olive oil; corn oil and soybean oil; glycols; such a propylene glycol; esters such as ethyl oleate and ethyl laurate; agar; buffering agents such as magnesium hydroxide and aluminum hydroxide; alginic acid; pyrogen-free water; isotonic saline; Ringer's solution; ethyl alcohol, and phosphate buffer solutions, as well as other non-toxic compatible lubricants such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, releasing agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the composition, according to the judgment of the formulator. The pharmaceutical compositions of this invention can be administered to humans and other animals orally, rectally, parenterally, intracisternally, intravaginally, intraperitoneally, topically (as by powders, ointments, or drops), buccally, or as an oral or nasal spray.

The pharmaceutical compositions of this invention may be administered orally, parenterally, by inhalation spray, topically, rectally, nasally, buccally, vaginally or via an implanted reservoir, preferably by oral administration or administration by injection. The pharmaceutical compositions of this invention may contain any conventional non-toxic pharmaceutically-acceptable carriers, adjuvants or vehicles. In some cases, the pH of the formulation may be adjusted with pharmaceutically acceptable acids, bases or buffers to enhance the stability of the formulated compound or its delivery form. The term parenteral as used herein includes subcutaneous, intracutaneous, intravenous, intramuscular, intraarticular, intraarterial, intrasynovial, intrasternal, intrathecal, intralesional and intracranial injection or infusion techniques.

Liquid dosage forms for oral administration include pharmaceutically acceptable emulsions, microemulsions, solutions, suspensions, syrups and elixirs. In addition to the active compounds, the liquid dosage forms may contain inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylene glycol, dimethylformamide, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor, and sesame oils), glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan, and mixtures thereof. Besides inert diluents, the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, and perfuming agents.

Injectable preparations, for example, sterile injectable aqueous or oleaginous suspensions may be formulated according to the known art using suitable dispersing or wetting agents and suspending agents. The sterile injectable preparation may also be a sterile injectable solution, suspension or emulsion in a nontoxic parenterally acceptable diluent or solvent, for example, as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution, U. S. P. and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose, any bland fixed oil can be employed including synthetic mono- or diglycerides. In addition, fatty acids such as oleic acid are used in the preparation of injectables.

The injectable formulations can be sterilized, for example, by filtration through a bacterial-retaining filter, or by incorporating sterilizing agents in the form of sterile solid compositions which can be dissolved or dispersed in sterile water or other sterile injectable medium prior to use.

In order to prolong the effect of a drug, it is often desirable to slow the absorption of the drug from subcutaneous or intramuscular injection. This may be accomplished by the use of a liquid suspension of crystalline or amorphous material with poor water solubility. The rate of absorption of the drug then depends upon its rate of dissolution, which, in turn, may depend upon crystal size and crystalline form. Alternatively, delayed absorption of a parenterally administered drug form is accomplished by dissolving or suspending the drug in an oil vehicle. Injectable depot forms are made by forming microencapsule matrices of the drug in biodegradable polymers such as polylactide-polyglycolide. Depending upon the ratio of drug to polymer and the nature of the particular polymer employed, the rate of drug release can be controlled. Examples of other biodegradable polymers include poly(orthoesters) and poly(anhydrides). Depot injectable formulations are also prepared by entrapping the drug in liposomes or microemulsions which are compatible with body tissues.

Compositions for rectal or vaginal administration are preferably suppositories which can be prepared by mixing the compounds of this invention with suitable non-irritating excipients or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at ambient temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound.

Solid dosage forms for oral administration include capsules, tablets, pills, powders, and granules. In such solid dosage forms, the active compound is mixed with at least one inert, pharmaceutically acceptable excipient or carrier such as sodium citrate or dicalcium phosphate and/or: a) fillers or extenders such as starches, lactose, sucrose, glucose, mannitol, and silicic acid, b) binders such as, for example, carboxymethylcellulose, alginates, gelatin, polyvinylpyrrolidinone, sucrose, and acacia, c) humectants such as glycerol, d) disintegrating agents such as agar-agar, calcium carbonate, potato or tapioca starch, alginic acid, certain silicates, and sodium carbonate, e) solution retarding agents such as paraffin, f) absorption accelerators such as quaternary ammonium compounds, g) wetting agents such as, for example, cetyl alcohol and glycerol monostearate, h) absorbents such as kaolin and bentonite clay, and i) lubricants such as talc, calcium stearate, magnesium stearate, solid polyethylene glycols, sodium lauryl sulfate, and mixtures thereof. In the case of capsules, tablets and pills, the dosage form may also comprise buffering agents.

Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like.

The active compounds can also be in micro-encapsulated form with one or more excipients as noted above. The solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings, release controlling coatings and other coatings well known in the pharmaceutical formulating art. In such solid dosage forms the active compound may be admixed with at least one inert diluent such as sucrose, lactose or starch. Such dosage forms may also comprise, as is normal practice, additional substances other than inert diluents, e.g., tableting lubricants and other tableting aids such a magnesium stearate and microcrystalline cellulose. In the case of capsules, tablets and pills, the dosage forms may also comprise buffering agents. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner. Examples of embedding compositions which can be used include polymeric substances and waxes.

Dosage forms for topical or transdermal administration of a compound of this invention include ointments, pastes, creams, lotions, gels, powders, solutions, sprays, inhalants or patches. The active component is admixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives or buffers as may be required. Ophthalmic formulation, ear drops, eye ointments, powders and solutions are also contemplated as being within the scope of this invention.

The ointments, pastes, creams and gels may contain, in addition to an active compound of this invention, excipients such as animal and vegetable fats, oils, waxes, paraffins, starch, tragacanth, cellulose derivatives, polyethylene glycols, silicones, bentonites, silicic acid, talc and zinc oxide, or mixtures thereof.

Powders and sprays can contain, in addition to the compounds of this invention, excipients such as lactose, talc, silicic acid, aluminum hydroxide, calcium silicates and polyamide powder, or mixtures of these substances. Sprays can additionally contain customary propellants such as chlorofluorohydrocarbons.

Transdermal patches have the added advantage of providing controlled delivery of a compound to the body. Such dosage forms can be made by dissolving or dispensing the compound in the proper medium. Absorption enhancers can also be used to increase the flux of the compound across the skin. The rate can be controlled by either providing a rate controlling membrane or by dispersing the compound in a polymer matrix or gel.

Unless otherwise defined, all technical and scientific terms used herein are accorded the meaning commonly known to one with ordinary skill in the art. All publications, patents, published patent applications, and other references mentioned herein are hereby incorporated by reference in their entirety.

Abbreviations

Abbreviations which have been used in the descriptions of the schemes and the examples that follow are:

-   ACN for acetonitrile; -   BOP for benzotriazol-1-yloxy-tris(dimethylamino)phosphonium     hexafluorophosphate; -   n-BuLi: n-butyl lithium -   BzCl for benzoyl chloride; -   CO: carbon monoxide; -   DCM for dichloromethane; -   DIPEA for diisopropyl ethylamine; -   DMAP for N,N-dimethylaminopyridine; -   DME for ethylene glycol dimethyl ether; -   DMEM for Dulbecco's Modified Eagles Media; -   DMF for N,N-dimethyl formamide; -   DMSO for dimethylsulfoxide; -   DPPP: 1,3-bis(diphenylphosphino)propane; -   Fe: iron; -   EDCI or EDC for 1-(3-diethylaminopropyl)-3-ethylcarbodiimide     hydrochloride; -   EtOAc for ethyl acetate; -   EtOH for ethyl alcohol; -   Ghosez's reagent: 1-chloro-N,N,2-trimethyl-1-propenylamine; -   HATU for O (7-Azabenzotriazole-1-yl)-N,N,N′,N′-tetramethyluronium     hexafluorophosphate; -   HCl for hydrochloric acid; -   NH4Cl: ammonium chloride; -   LiOH: lithium hydroxide; -   Pd(OAc)₂: palladium acetate; -   Ph for phenyl; -   Py: pyridine; -   PyBOP: (benzotriazol-1-yloxy)tripyrrolidinophosphonium     hexafluorophosphate; -   RT for reverse transcription; -   RT-PCR for reverse transcription-polymerase chain reaction; -   TEA for triethylamine; -   TFA for trifluoroacetic acid; -   THE for tetrahydrofuran; -   TLC for thin layer chromatography; -   TBS for t-Butyldimethylsilyl; -   TMS for trimethylsilyl; -   Ts for p-CH₃C₆H₄SO₂—; -   Weinreb amide for N-methoxy-N-methylamide     Synthetic Methods

The compounds and processes of the present invention will be better understood in connection with the following synthetic schemes that illustrate the methods by which the compounds of the invention may be prepared, which are intended as an illustration only and not to limit the scope of the invention. Various changes and modifications to the disclosed embodiments will be apparent to those skilled in the art and such changes and modifications including, without limitation, those relating to the chemical structures, substituents, derivatives, and/or methods of the invention may be made without departing from the spirit of the invention and the scope of the appended claims.

Scheme 1 illustrates methods for preparing a compound of formula 14, wherein X is bromo or iodo; Y is hydrogen or bromo or iodo; R₁, n, R₂, m, R₃, v, R₄, R₅, ring A and ring B are defined as previously. Direct replacement of fluoro with amine as describe in Scheme 1 followed by hydrolysis of the ester with a base such as but not limited to, LiOH or NaOH, gives the acid compound 4. Compound 4 is reacted with Weinreb amide 5 to afford 6 which is reacted with 7 under a strong base such as but not limited to, n-BuLi or the like, to give the ketone 8. After reducing the nitro group of 8 by a reducing reagent, such as but not limited to, Fe/HCl or Zn/AcOH, to convert to aniline intermediate which is cyclized in situ to provide 9. Compound 9 is coupled with acid 10 by a coupling reagent, such as but not limited to, HATU or PyBOP or Ghosez's reagent, to give the amide 11. Compound 11 is esterified by reacting with carbon monoxide catalyzed by an appropriate Pd or Ni catalyst or the like, to afford compound 12. Hydrolysis of the ester 12 with a base such as, but not limited to, LiOH or NaOH, gives acid compound 13. Compounds of formula 14 are prepared from the reaction of compound 13 with

Scheme 2 illustrates methods or preparing a compound of formula 29, wherein X is bromo or iodo; Y is hydrogen or bromo or iodo; Z is CH or N; R₁, n, R₂, m, R₃, v, R₄, R₅, ring A and ring B are defined as previously. Compound 15 is reacted with Weinreb amide 5 to afford 16 which reacts with 7 under a strong base such as but not limited to, n-BuLi or the like, to give the ketone 17. After removal of the Boc group of 17, the resulting free amine 18 is reacted with 19 to form 20 by direct replacement. After reducing the nitro group of 20 by a reducing reagent, such as but not limited to, Fe/HCl or Zn/AcOH, to convert to aniline intermediate 21. Followed by installation of substituted or unsubstituted 4-nitrobenzoyl group 22 to 21 provides compound 23. With 23 in hand, compounds of formula 29 were prepared by adapting the similar conditions as described in scheme 1 for compounds of formula 14.

EXAMPLES

The compounds and processes of the present invention will be better understood in connection with the following examples, which are intended as an illustration only and not limiting of the scope of the invention. Various changes and modifications to the disclosed embodiments will be apparent to those skilled in the art and such changes and modifications including, without limitation, those relating to the chemical structures, substituents, derivatives, formulations and/or methods of the invention may be made without departing from the spirit of the invention and the scope of the appended claims.

Example 1

Example 1 Step a

To a 100-mL round-bottom flask were added 1-fluoro-2-nitrobenzene (10.0 g, 70.87 mmol), DMSO (20 mL), DIPEA (36.64 g, 283 mmol) and methyl (2S)-2-aminopropanoate (14.62 g, 141.74 mmol). The resulting solution was stirred for 24 hrs at 50° C. and then extracted with ethyl acetate (100 mL×3). The combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (11.0 g, 69.2%) as a yellow oil. ESI-MS m z: 225.15 [M+H]⁺.

Example 1 Step b

To a 250-mL round-bottom flask were added the compound from step a (11.00 g, 49.06 mmol), LiOH (2.35 g, 98.12 mmol), H₂O (20 mL) and MeOH (100 mL). The resulting solution was stirred for 2 hrs at room temperature. The pH value of the solution was adjusted to 6 with aq. HCl. The resulting solution was extracted with ethyl acetate (100 mL×3). The combined organic layer was washed with brine, dried and concentrated. The residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (7.6 g, 73.7%) as a yellow oil. ESI-MS m z: 211.05 [M+H]⁺.

Example 1 Step c

To a 100-mL round-bottom flask were added the compound from step b (7.60 g, 36.15 mmol), HATU (27.50 g, 72.32 mmol), DIEA (9.35 g, 72.34 mmol), N,O-dimethylhydroxylamine hydrochloride (7.05 g, 72.27 mmol) and DMF (20 mL). The resulting solution was stirred for 3 hrs at room temperature. The resulting solution was extracted with ethyl acetate (100 mL×3) and the organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (8.3 g, 90.6%) as an orange solid. ESI-MS m z: 254.20 [M+H]⁺.

Example 1 Step d

To a stirred solution of 2,5-dibromothiophene (2.87 g, 11.86 mmol) in THE (20 mL) was added n-BuLi (0.61 g, 9.52 mmol) dropwise at −40° C. under nitrogen atmosphere over 15 min. Then the compound from step c (1.20 g, 4.73 mmol) in THE (5 mL) was added dropwise at −40° C. and stirred for 1 h at room temperature under nitrogen atmosphere. The reaction was quenched by the addition of water (100 mL) at room temperature. The resulting mixture was extracted with ethyl acetate (100 mL×3). The combined organic layer was washed with brine, dried over anhydrous Na₂SO₄ and concentrated to afford the desired product (crude) (1.2 g, 91.7%) as a yellow oil. ESI-MS m z: 354.90 [M+H]⁺.

Example 1 Step e

To a 50-mL round-bottom flask were added the compound from step d (1.2 g, crude), NH₄Cl (2.71 g, 50.66 mmol), Fe (2.83 g, 50.67 mmol) and EtOH:H₂O=2:1 (30 mL). The resulting solution was heated for 1 h at 80° C. After filtered through Celite, the filtrate was extracted with ethyl acetate (100 mL×3). The combined organic layer was washed with brine, dried over anhydrous Na₂SO₄ and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (560 mg, 48.4%) as a yellow oil. ESI-MS m z: 306.90 [M+H]⁺.

Example 1 Step f

A solution of 4-(5-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinamido)benzoic acid (447 mg, 1.17 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (391 mg, 2.93 mmol) in DCM (10 mL) was stirred for 0.5 hr at room temperature under nitrogen atmosphere. Then the resulting mixture was concentrated under vacuum and the residue was dissolved into DCM (10 mL). To this solution, compound from step e (300 mg, 0.97 mmol) and pyridine (231 mg, 2.93 mmol) were added at 0° C. The resulting mixture was stirred for 0.5 h at 0° C. After concentrated, the crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (470 mg, 71.8%) as a yellow solid. ESI-MS m z: 670.10 [M+H]⁺.

Example 1 Step g

A solution of the compound from step f (400 mg, 0.59 mmol), Pd(OAc)₂ (53.56 mg, 0.23 mmol) and dppp (98 mg, 0.23 mmol) in EtOH:DMF:TEA=4:4:1 (9 mL) was stirred for 4 hrs at 70° C. under 10 atm CO atmosphere. The resulting mixture was concentrated under vacuum and the crude residue was purified by silica gel column chromatography eluting with 0-10% MeOH/DCM to afford the desired product (350 mg, 90.3%) as a yellow solid. ESI-MS m z: 664.25 [M+H]⁺.

Example 1 Step h

A solution of the compound from step g (350 mg, 0.52 mmol) and LiOH (72 mg, 3.01 mmol) in EtOH:H₂O=2:1 (30 mL) was stirred for 1 h at room temperature. The pH of the resulting solution was adjusted to 6 with aq. HCl and extracted with ethyl acetate (50 mL×3). The combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (300 mg, 89.5%) as a yellow solid. ESI-MS m z: 636.40 [M+H]⁺.

Example 1 Step i

A solution of the compound from h (50 mg, 0.08 mmol) and (1-chloro-2-methylprop-1-en-1-yl)-dimethylamine (32 mg, 0.23 mmol) in DCM (10 mL) was stirred for 2 hrs at room temperature. Then the resulting mixture was concentrated under vacuum and the residue was dissolved into DCM (5 mL). To this solution, cyclopropanamine (14 mg, 0.23 mmol) and pyridine (18 mg, 0.23 mmol) in DCM (5 mL) were added slowly at 0° C. and was further stirred for 0.5 h at 0° C. The resulting solution was extracted with DCM (10 mL×3) and the combined organic layer was washed with brine, dried and concentrated. The residue was purified by Prep-HPLC (CH₃CN/H₂O) to afford the desired product (18.3 mg, 34.5%) as a yellow solid. ESI-MS m z: 675.35 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.59 (dt, J=7.1, 4.5 Hz, 2H), 0.72 (td, J=7.1, 4.7 Hz, 2H), 1.19 (d, J=6.9 Hz, 3H), 1.65 (t, J=5.2 Hz, 4H), 2.19 (s, 3H), 2.83 (tt, J=7.8, 3.9 Hz, 1H), 3.48 (t, J=5.1 Hz, 4H), 3.65 (s, 4H), 5.76 (q, J=6.8 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 7.00 (td, J=7.7, 1.6 Hz, 1H), 7.18 (td, J=7.6, 1.3 Hz, 1H), 7.36 (d, J=8.3 Hz, 2H), 7.44 (dd, J=7.9, 1.5 Hz, 1H), 7.54 (d, J=2.3 Hz, 1H), 7.69 (d, J=8.2 Hz, 2H), 7.77 (d, J=4.1 Hz, 1H), 7.90 (d, J=4.1 Hz, 1H), 8.06 (d, J=2.2 Hz, 1H), 8.65 (d, J=4.2 Hz, 1H), 10.51 (s, 1H).

Example 2

The title compound was prepared using a procedure similar to that used to prepare Example 1 where 2-fluoro-6-methylaniline was used in place of cyclopropanamine. ESI-MS m z: 743.35 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.23 (d, J=6.9 Hz, 3H), 1.65 (t, J=5.2 Hz, 4H), 2.20 (s, 3H), 2.26 (s, 3H), 3.48 (t, J=5.2 Hz, 4H), 3.65 (s, 4H), 5.81 (q, J=6.9 Hz, 1H), 6.69 (d, J=8.0 Hz, 1H), 7.02 (td, J=7.7, 1.6 Hz, 1H), 7.11-7.23 (m, 3H), 7.29 (td, J=7.9, 5.6 Hz, 1H), 7.38 (d, J=8.3 Hz, 2H), 7.46 (dd, J=7.8, 1.5 Hz, 1H), 7.54 (d, J=2.3 Hz, 1H), 7.70 (d, J=8.4 Hz, 2H), 8.00 (d, J=4.1 Hz, 1H), 8.02-8.09 (m, 2H), 10.12 (s, 1H), 10.52 (s, 1H).

Example 3

The title compound was prepared using a procedure similar to that used to prepare Example 1 where cyclobutanamine was used in place of cyclopropanamine and was further separated by chiral-HPLC to give the desired compound as a yellow solid. ESI-MS m z: 689.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.20 (d, J=6.9 Hz, 3H), 1.62-1.75 (m, 6H), 2.07 (dt, J=11.4, 9.2 Hz, 2H), 2.20 (s, 3H), 2.23 (dd, J=7.5, 3.7 Hz, 2H), 3.48 (t, J=5.1 Hz, 4H), 3.65 (s, 4H), 4.39 (q, J=8.1 Hz, 1H), 5.78 (q, J=6.9 Hz, 1H), 6.67 (d, J=8.1 Hz, 1H), 7.01 (td, J=7.7, 1.6 Hz, 1H), 7.18 (td, J=7.6, 1.3 Hz, 1H), 7.37 (d, J=8.3 Hz, 2H), 7.45 (dd, J=7.8, 1.5 Hz, 1H), 7.55 (d, J=2.3 Hz, 1H), 7.69 (d, J=8.4 Hz, 2H), 7.85 (d, J=4.0 Hz, 1H), 7.92 (d, J=4.1 Hz, 1H), 8.07 (d, J=2.3 Hz, 1H), 8.82 (d, J=7.6 Hz, 1H), 10.52 (s, 1H).

Example 4

Example 4 Step a

A solution of 1,4-diiodobenzene (5.86 g, 17.76 mmol) in THE (10 mL) was added n-BuLi (6.3 mL, 15.77 mmol) at −90° C. under N₂ atmosphere. The resulting mixture was stirred for 15 min at −90° C. under nitrogen atmosphere. Then the compound from Example 1 Step c (1.0 g, 3.95 mmol) in THE (5 mL) was slowly added at −90° C. After the resulting solution was stirred for 1 h at room temperature, it was quenched with water. The resulting solution was extracted with ethyl acetate (100 mL×3) and the combined organic layer was washed with brine, dried and concentrated to afford the desired product (crude) as a yellow oil. ESI-MS m z: 397.00 [M+H]⁺.

Example 4 Step b

A solution of the compound from step a (crude), NH₄Cl (473 mg, 8.83 mmol) and Fe (493 mg, 8.83 mmol) in EtOH:H₂O=2:1 (30 mL) was heated for 40 min at 50° C. After filtered through Celite, the filtrate was extracted with ethyl acetate (100 mL×3). The combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (730 mg) as a yellow oil. ESI-MS m z: 349.10 [M+H]⁺.

Example 4 Step c

A solution of 4-(5-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinamido)benzoic acid (328 mg, 0.86 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (229 mg, 1.72 mmol) in DCM (10 mL) was stirred for 2 hrs at room temperature. Then the resulting mixture was concentrated under vacuum and the residue was dissolved into DCM (20 mL). To this solution, the compound from step b (360 mg, 1.03 mmol) and pyridine (245 mg, 3.10 mmol) in DCM (10 mL) were added slowly at 0° C. and was further stirred for 0.5 h at 0° C. The resulting solution was extracted with ethyl acetate (50 mL×3) and the combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (430 mg, 67%) as a yellow solid. ESI-MS m z: 712.40 [M+H]⁺.

Example 4 Step d

A solution of the compound from step c (230 mg, 0.32 mmol), Pd(OAc)₂ (15 mg, 0.06 mmol) and dppp (53 mg, 0.13 mmol) in EtOH:DMF:TEA=4:4:1 (9 mL) was stirred for 4 hrs at 70° C. under 10 atm CO atmosphere. Then the resulting mixture was concentrated under vacuum and the crude residue was purified by TLC plate (MeOH/CH₂Cl₂=1:15) to afford the desired product (200 mg crude) as a yellow solid. ESI-MS m z: 658.45 [M+H]⁺.

Example 4 Step e

A solution of the compound from step d (200 mg crude) and LiOH (73 mg, 3.04 mmol) in EtOH:H₂O=2:1 (30 mL) was stirred for 1 h at room temperature. The pH of the resulting solution was adjusted to 6 with aq. HCl and then extracted with ethyl acetate (50 mL×3). The combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (100 mg) as a yellow solid. ESI-MS m z: 630.40 [M+H]⁺.

Example 4 Step f

A solution of the compound from e (50 mg, 0.08 mmol) and (1-chloro-2-methylprop-1-en-1-yl)-dimethylamine (35 mg, 0.26 mmol) in DCM (10 mL) was stirred for 2 hrs at room temperature. The resulting mixture was concentrated under vacuum and the residue was dissolved into DCM (10 mL). To this solution, cyclopropanamine (15 mg, 0.26 mmol) and pyridine (21 mg, 0.26 mmol) in DCM (10 mL) were added slowly at 0° C. and was further stirred for 0.5 h at 0° C. The resulting solution was extracted with DCM (20 mL×3) and the combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by Prep-HPLC (CH₃CN/H₂O) to afford the desired product (13.5 mg, 26%) as a light yellowish solid. ESI-MS m z: 669.40 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.62 (m, 2H), 0.72 (dt, J=6.8, 3.3 Hz, 2H), 1.17 (d, J=6.9 Hz, 3H), 1.65 (t, J=5.1 Hz, 4H), 2.19 (s, 3H), 2.88 (tq, J=7.8, 4.1 Hz, 1H), 3.48 (t, J=5.2 Hz, 4H), 3.65 (s, 4H), 5.88 (q, J=6.9 Hz, 1H), 6.71 (d, J=8.1 Hz, 1H), 7.04 (t, J=7.7 Hz, 1H), 7.20 (t, J=7.6 Hz, 1H), 7.37 (d, J=8.3 Hz, 2H), 7.51-7.57 (m, 2H), 7.69 (d, J=8.3 Hz, 2H), 7.98 (d, J=8.2 Hz, 2H), 8.06 (d, J=2.2 Hz, 1H), 8.20 (d, J=8.2 Hz, 2H), 8.62 (d, J=4.3 Hz, 1H), 10.52 (s, 1H).

Example 5

The title compound was prepared using a procedure similar to that used to prepare Example 4 where 2-fluoro-6-methylaniline was used in place of cyclopropanamine. ESI-MS m z: 737.45 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.21 (d, J=7.0 Hz, 3H), 1.66 (t, J=5.2 Hz, 4H), 2.20 (s, 3H), 2.26 (s, 3H), 3.48 (t, J=5.2 Hz, 4H), 3.65 (s, 4H), 5.92 (q, J=6.8 Hz, 1H), 6.74 (d, J=8.1 Hz, 1H), 7.06 (td, J=7.7, 1.6 Hz, 1H), 7.17 (d, J=8.2 Hz, 2H), 7.19-7.34 (m, 2H), 7.39 (d, J=8.3 Hz, 2H), 7.52-7.61 (m, 2H), 7.71 (d, J=8.4 Hz, 2H), 8.07 (d, J=2.2 Hz, 1H), 8.17 (d, J=8.2 Hz, 2H), 8.30 (d, J=8.3 Hz, 2H), 10.10 (s, 1H), 10.53 (s, 1H).

Example 6

Example 6 Step a

A solution of O-fluoronitrobenzene (5.0 g, 35.43 mmol), DIPEA (18.32 g, 141.74 mmol) and methyl D-alaninate (7.31 g, 70.87 mmol) in DMSO (30 mL) was heated at 50° C. for 16 hrs. The resulting solution was extracted with EA (100 mL×3) and the combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (5.0 g crude) as a yellow oil. ESI-MS m z: 225.15 [M+H]⁺.

Example 6 Step b

A solution of the compound from step a (5.0 g crude) and LiOH (5.34 g, 222.30 mmol) in MeOH:H₂O=2:1 (60 mL) was stirred for 2 hrs at room temperature. The pH of the resulting solution was adjusted to 6 with aq. HCl and extracted with ethyl acetate (100 mL×3), the organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (4.7 g crude) as a yellow oil. ESI-MS m z: 211.05 [M+H]⁺.

Example 6 Step c

A solution of the compound from step b (4.7 g crude), DIPEA (5.78 g, 44.72 mmol), HATU (17 g, 44.72 mmol) and N,O-dimethylhydroxylamine hydrochloride (4.36 g, 44.72 mmol) in DMF (20 mL) was stirred for 3 hrs at room temperature. The resulting solution was extracted with ethyl acetate (200 mL×3) and the combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (4.6 g) as a yellowish oil. ESI-MS m z: 254.20 [M+H]⁺.

Example 6 Step d

A solution of 2-bromothiophene (1.61 g, 9.87 mmol) in THE (20 mL) was added n-BuLi (3.2 mL, 7.90 mmol) at −90° C. under nitrogen atmosphere. After the resulting mixture was stirred for 15 min at −90° C., the compound from step c (1.0 g, 3.95 mmol) in THE (5 mL) was added slowly at −90° C. The resulting solution was stirred for 1 h at room temperature, then extracted with ethyl acetate (100 mL×3). The combined organic layer was washed with brine, dried and concentrated to afford the desired product (crude) as a yellow oil which will be used directly for the next step. ESI-MS m z: 354.90 [M+H]⁺.

Example 6 Step e

A solution of the compound from step d (crude), NH₄Cl (987 mg, 18.45 mmol) and Fe (1.03 g, 18.45 mmol) in EtOH:H₂O=2:1 (30 mL) was stirred for 30 min at 80° C. After filtered through Celite, the filtrate was extracted with ethyl acetate (50 mL×3). The combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (430 mg) as a yellow oil. ESI-MS m z: 306.90 [M+H]⁺.

Example 6 Step f

A solution of 4-(5-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinamido)benzoic acid (328 mg, 0.86 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (287 mg, 2.14 mmol) in DCM (10 mL) was stirred for 2 hrs at room temperature. Then the resulting mixture was concentrated under vacuum and the residue was dissolved into DCM (10 mL). To this solution, the compound from step e (220 mg, 0.72 mmol) and pyridine (170 mg, 2.14 mmol) in DCM (10 mL) were added at 0° C. The resulting solution was stirred for 0.5 h at 0° C. and diluted with DCM (50 mL). The organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (280 mg, 58%) as a pale yellow solid. ESI-MS m z: 670.10 [M+H]⁺.

Example 6 Step g

A solution of the compound from step f (280 mg, 0.42 mmol), Pd(OAc)₂ (19 mg, 0.08 mmol) and dppp (69 mg, 0.17 mmol) in EtOH:DMF:TEA=4:4:1 (9 mL) was stirred for 4 hrs at 70° C. under 10 atm CO atmosphere. After concentrated under vacuum, the crude residue was purified by TLC plate (MeOH/CH₂Cl₂=1:15) to afford the desired product (200 mg) as a yellow crude solid. ESI-MS m z: 664.25 [M+H]⁺.

Example 6 Step h

A solution of the compound from step g (200 mg crude) and LiOH (72 mg, 3.01 mmol) in EtOH:H₂O=2:1 (30 mL) was stirred for 1 h at room temperature. The pH of the resulting solution was adjusted to 6 with aq. HCl and extracted with ethyl acetate (50 mL×3). The combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (130 mg) as a yellow solid. ESI-MS m z: 636.40 [M+H]⁺.

Example 6 Step i

A solution of the compound from step h (50 mg, 0.08 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (32 mg, 0.23 mmol) in DCM (10 mL) was stirred for 2 hrs at room temperature. The resulting mixture was concentrated under vacuum and the residue was dissolved into DCM (5 mL). To this solution, cyclopropanamine (14 mg, 0.23 mmol) and pyridine (18 mg, 0.23 mmol) in DCM (2 mL) were added at 0° C. The resulting solution was stirred for 0.5 h at 0° C. and then diluted with DCM (50 mL). The organic layer was washed with brine, dried and concentrated. The crude residue was purified by Prep-HPLC (CH₃CN/H₂O) to afford the desired product (25.1 mg, 47%) as a yellow solid. ESI-MS m z: 675.35 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.59 (dt, J=7.1, 4.5 Hz, 2H), 0.72 (td, J=7.1, 4.7 Hz, 2H), 1.19 (d, J=6.9 Hz, 3H), 1.65 (t, J=5.2 Hz, 4H), 2.19 (s, 3H), 2.83 (tt, J=7.8, 3.9 Hz, 1H), 3.48 (t, J=5.1 Hz, 4H), 3.65 (s, 4H), 5.76 (q, J=6.8 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 7.00 (td, J=7.7, 1.6 Hz, 1H), 7.18 (td, J=7.6, 1.3 Hz, 1H), 7.36 (d, J=8.3 Hz, 2H), 7.44 (dd, J=7.9, 1.5 Hz, 1H), 7.54 (d, J=2.3 Hz, 1H), 7.69 (d, J=8.2 Hz, 2H), 7.77 (d, J=4.1 Hz, 1H), 7.90 (d, J=4.1 Hz, 1H), 8.06 (d, J=2.2 Hz, 1H), 8.65 (d, J=4.2 Hz, 1H), 10.51 (s, 1H).

Example 7

The title compound was prepared using a procedure similar to that used to prepare Example 6 where 2-fluoro-6-methylaniline was used in place of cyclopropanamine. ESI-MS m z: 743.35 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.23 (d, J=6.9 Hz, 3H), 1.65 (t, J=5.2 Hz, 4H), 2.20 (s, 3H), 2.26 (s, 3H), 3.48 (t, J=5.2 Hz, 4H), 3.65 (s, 4H), 5.81 (q, J=6.9 Hz, 1H), 6.69 (d, J=8.0 Hz, 1H), 7.02 (td, J=7.7, 1.6 Hz, 1H), 7.11-7.23 (m, 3H), 7.29 (td, J=7.9, 5.6 Hz, 1H), 7.38 (d, J=8.3 Hz, 2H), 7.46 (dd, J=7.8, 1.5 Hz, 1H), 7.54 (d, J=2.3 Hz, 1H), 7.70 (d, J=8.4 Hz, 2H), 8.00 (d, J=4.1 Hz, 1H), 8.02-8.09 (m, 2H), 10.12 (s, 1H), 10.52 (s, 1H).

Example 8

The title compound was prepared using a procedure similar to that used to prepare Example 6 where 1-methylcyclopropane-1-amine hydrochloride was used in place of cyclopropanamine. ESI-MS m z: 689.15[M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.64 (q, J=5.1, 4.6 Hz, 2H), 0.74-0.81 (m, 2H), 1.19 (d, J=6.9 Hz, 3H), 1.25 (s, 1H), 1.39 (s, 3H), 1.66 (t, J=5.2 Hz, 4H), 2.20 (s, 3H), 3.49 (t, J=5.1 Hz, 4H), 3.65 (s, 4H), 5.77 (q, J=6.9 Hz, 1H), 6.68 (d, J=8.0 Hz, 1H), 7.01 (t, J=7.9 Hz, 1H), 7.18 (t, J=7.6 Hz, 1H), 7.37 (d, J=8.3 Hz, 2H), 7.46 (d, J=7.8 Hz, 1H), 7.55 (d, J=2.2 Hz, 1H), 7.69 (d, J=8.3 Hz, 2H), 7.78 (d, J=4.0 Hz, 1H), 7.88 (d, J=4.1 Hz, 1H), 8.07 (d, J=2.2 Hz, 1H), 8.86 (s, 1H), 10.52 (s, 1H).

Example 9

The title compound was prepared using a procedure similar to that used to prepare Example 6 where cyclobutylamine hydrochloride was used in place of cyclopropanamine. ESI-MS m z: 689.35 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.21 (d, J=6.9 Hz, 3H), 1.65 (s, 1H), 1.64-1.76 (m, 5H), 2.08 (dt, J=11.6, 9.3 Hz, 2H), 2.20 (s, 3H), 2.25 (dt, J=11.4, 4.0 Hz, 2H), 3.49 (t, J=5.1 Hz, 4H), 3.65 (s, 4H), 4.39 (h, J=8.2 Hz, 1H), 5.78 (q, J=6.9 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 7.01 (td, J=7.7, 1.6 Hz, 1H), 7.18 (td, J=7.6, 1.3 Hz, 1H), 7.37 (d, J=8.3 Hz, 2H), 7.45 (dd, J=7.8, 1.5 Hz, 1H), 7.55 (d, J=2.3 Hz, 1H), 7.69 (d, J=8.3 Hz, 2H), 7.85 (d, J=4.0 Hz, 1H), 7.92 (d, J=4.1 Hz, 1H), 8.07 (d, J=2.2 Hz, 1H), 8.81 (d, J=7.7 Hz, 1H), 10.52 (s, 1H).

Example 10

The title compound was prepared using a procedure similar to that used to prepare Example 6 where 3,3-difluorocyclobutane-1-amine hydrochloride was used in place of cyclopropanamine. ESI-MS m z: 725.35 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.21 (d, J=6.9 Hz, 3H), 1.66 (t, J=5.1 Hz, 4H), 2.20 (s, 3H), 2.77 (d, J=13.1 Hz, 2H), 2.95-3.03 (m, 2H), 3.49 (t, J=5.1 Hz, 4H), 3.66 (s, 4H), 4.23-4.31 (m, 1H), 5.76-5.83 (m, 1H), 6.68 (d, J=8.1 Hz, 1H), 7.02 (t, J=7.8 Hz, 1H), 7.19 (t, J=7.6 Hz, 1H), 7.37 (d, J=8.3 Hz, 2H), 7.46 (d, J=7.8 Hz, 1H), 7.55 (d, J=2.3 Hz, 1H), 7.70 (d, J=8.3 Hz, 2H), 7.85 (d, J=4.1 Hz, 1H), 7.95 (d, J=4.1 Hz, 1H), 8.07 (d, J=2.2 Hz, 1H), 9.02 (d, J=6.7 Hz, 1H), 10.52 (s, 1H).

Example 11

The title compound was prepared using a procedure similar to that used to prepare Example 6 where 1-methylcyclobutane-1-amine was used in place of cyclopropanamine. ESI-MS m z: 703.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.19 (d, J=6.8 Hz, 3H), 1.49 (s, 2H), 1.65 (d, J=5.8 Hz, 3H), 1.83 (t, J=7.9 Hz, 2H), 1.96 (d, J=31.9 Hz, 3H), 2.20 (s, 3H), 2.36 (d, J=11.9 Hz, 3H), 3.48 (t, J=5.3 Hz, 4H), 3.65 (s, 4H), 5.74-5.82 (m, 1H), 6.67 (d, J=8.1 Hz, 1H), 7.01 (t, J=7.7 Hz, 1H), 7.18 (t, J=7.7 Hz, 1H), 7.37 (d, J=8.2 Hz, 2H), 7.45 (d, J=7.9 Hz, 1H), 7.54 (d, J=1.9 Hz, 1H), 7.69 (d, J=8.3 Hz, 2H), 7.85 (d, J=4.1 Hz, 1H), 7.90 (d, J=3.7 Hz, 1H), 8.07 (s, 1H), 8.59 (s, 1H), 10.52 (s, 1H).

Example 12

The title compound was prepared using a procedure similar to that used to prepare Example 6 where bicyclo[1.1.1]pentan-1-amine hydrochloride was used in place of cyclopropanamine. ESI-MS m z: 701.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.20 (d, J=6.9 Hz, 3H), 1.65 (t, J=5.2 Hz, 4H), 2.10 (s, 6H), 2.19 (s, 3H), 2.48 (s, 1H), 2.94 (s, 1H), 3.48 (t, J=5.1 Hz, 4H), 3.65 (s, 4H), 5.77 (q, J=6.9 Hz, 1H), 6.67 (d, J=8.1 Hz, 1H), 7.01 (td, J=7.8, 1.6 Hz, 1H), 7.17 (td, J=7.6, 1.3 Hz, 1H), 7.36 (d, J=8.3 Hz, 2H), 7.46 (dd, J=7.9, 1.5 Hz, 1H), 7.54 (d, J=2.3 Hz, 1H), 7.69 (d, J=8.4 Hz, 2H), 7.80 (d, J=4.1 Hz, 1H), 7.90 (d, J=4.1 Hz, 1H), 8.06 (d, J=2.5 Hz, 1H), 9.18 (s, 1H), 10.52 (s, 1H).

Example 13

The title compound was prepared using a procedure similar to that used to prepare Example 6 where 3-methylbicyclo[1.1.1]pentan-1-amine hydrochloride was used in place of cyclopropanamine. ESI-MS m z: 715.30 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.13-1.26 (m, 6H), 1.65 (t, J=5.2 Hz, 4H), 1.97 (s, 6H), 2.19 (s, 3H), 3.48 (t, J=5.1 Hz, 4H), 3.65 (s, 4H), 5.76 (q, J=6.9 Hz, 1H), 6.66 (d, J=8.0 Hz, 1H), 7.00 (td, J=7.7, 1.6 Hz, 1H), 7.17 (td, J=7.6, 1.3 Hz, 1H), 7.36 (d, J=8.3 Hz, 2H), 7.45 (dd, J=7.8, 1.5 Hz, 1H), 7.54 (d, J=2.3 Hz, 1H), 7.68 (d, J=8.3 Hz, 2H), 7.80 (d, J=4.0 Hz, 1H), 7.89 (d, J=4.1 Hz, 1H), 8.04-8.09 (m, 1H), 9.11 (s, 1H), 10.52 (s, 1H).

Example 14

The title compound was prepared using a procedure similar to that used to prepare Example 6 where 3-fluoropyridin-2-amine was used in place of cyclopropanamine. ESI-MS m z: 730.40 [M+H]⁺. ¹H NMR (400 MHz, Methanol-d₄) δ 1.32 (d, J=7.1 Hz, 4H), 1.79 (t, J=5.1 Hz, 4H), 2.27 (s, 3H), 3.62 (t, J=5.2 Hz, 4H), 3.78 (s, 4H), 5.95 (d, J=7.3 Hz, 1H), 6.73 (d, J=8.0 Hz, 1H), 7.03 (t, J=7.6 Hz, 1H), 7.24 (t, J=7.7 Hz, 1H), 7.44 (d, J=8.3 Hz, 3H), 7.50-7.57 (m, 1H), 7.62 (s, 1H), 7.75 (dd, J=23.3, 8.8 Hz, 3H), 7.85 (d, J=4.1 Hz, 1H), 7.99 (d, J=4.0 Hz, 1H), 8.05 (s, 1H), 8.33 (d, J=4.7 Hz, 1H).

Example 15

Example 15 Step a

A mixture of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid (328 mg, 1.25 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (330 mg, 2.5 mmol) in DCM (20 mL) was stirred for 1 h at room temperature. The solvent was removed and the residue was dissolved in DCM (20 mL). Ethyl 5-[(3R)-4-(4-aminobenzoyl)-3-methyl-3H-quinoxalin-2-yl]thiophene-2-carboxylate (350 mg, 0.834 mmol) and pyridine (0.5 mL) in DCM (10 mL) were added and the mixture was stirred for 1 h at room temperature. After evaporated the solvent, the residue was purified by reverse flash chromatography to give the desired product (380 mg, 69%) as a yellow oil. ESI-MS m z: 664.10 [M+H]⁺.

Example 15 Step b

A mixture of the compound from step a (380 mg, 0.57 mmol), LiOH (137 mg, 5.72 mmol) in EtOH:H₂O=1:1 (40 mL) was stirred for 2 hrs at room temperature. The pH value of the solution was adjusted to 5 with aq. HCl and then solvents were evaporated. The crude residue was purified by reverse flash chromatography to give the desired product (320 mg, 88%) as a yellow solid. ESI-MS m z: 636.40 [M+H]⁺.

Example 15 Step c

A mixture of the compound from step b (80 mg, 0.13 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (50 mg, 0.38 mmol) in DCM (10 mL) was stirred for 1 h at room temperature. The reaction mixture was evaporated in vacuo and the residue was dissolved in DCM (2 mL). To this solution, cyclopropanamine (36 mg, 0.63 mmol) and pyridine (0.5 mL) in DCM (2 mL) were added and the mixture was stirred for 1 h at room temperature. After evaporated, the residue was purified by reverse flash chromatography to give the desired product (19.1 mg, 22%) as a yellow solid. ESI-MS m z: 675.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.64-0.56 (m, 2H), 0.78-0.66 (m, 2H), 1.20 (d, J=4.0 Hz, 3H), 1.65 (t, J=4.0 Hz, 4H), 2.34 (s, 3H), 2.90-2.78 (m, 1H), 3.49 (t, J=4.0 Hz, 4H), 3.67 (s, 4H), 5.77 (q, J=8.0 Hz, 1H), 6.60 (d, J=8.0 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 7.01 (t, J=8.0 Hz, 1H), 7.17 (t, J=8.0 Hz, 1H), 7.35 (d, J=8.0 Hz, 2H), 7.45 (d, J=8.0 Hz, 1H), 7.59 (d, J=8.0 Hz, 1H), 7.69 (d, J=8.0 Hz, 2H), 7.78 (d, J=4.0 Hz, 1H), 7.90 (d, J=4.0 Hz, 1H), 8.67 (d, J=4.0 Hz, 1H), 10.44 (s, 1H).

Example 16

The title compound was prepared using a procedure similar to that used to prepare Example 15 where cyclobutanamine was used in place of cyclopropanamine. ESI-MS m z: 689.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.20 (d, J=4.0 Hz, 3H), 1.76-1.62 (m, 6H), 2.13-2.03 (m, 2H), 2.28-2.19 (m, 2H), 2.34 (s, 3H), 3.49 (t, J=4.0 Hz, 4H), 3.67 (s, 4H), 4.44-4.34 (m, 1H), 5.77 (q, J=8.0 Hz, 1H), 6.60 (d, J=8.0 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 7.01 (t, J=8.0 Hz, 1H), 7.18 (t, J=8.0 Hz, 1H), 7.36 (d, J=8.0 Hz, 2H), 7.45 (d, J=8.0 Hz, 1H), 7.59 (d, J=8.0 Hz, 1H), 7.68 (d, J=8.0 Hz, 2H), 7.85 (d, J=4.0 Hz, 1H), 7.92 (d, J=4.0 Hz, 1H), 8.82 (d, J=4.0 Hz, 1H), 10.44 (s, 1H).

Example 17

The title compound was prepared using a procedure similar to that used to prepare Example 15 where 2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)-6,7-dihydro-5H-cyclopenta[b]pyridine-3-carboxylic acid was used in place of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid in step a. ESI-MS m z: 701.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.64-0.56 (m, 2H), 0.76-0.69 (m, 2H), 1.20 (d, J=4.0 Hz, 3H), 1.65 (t, J=4.0 Hz, 4H), 2.07-1.99 (m, 1H), 2.87-2.76 (m, 5H), 3.49 (t, J=4.0 Hz, 4H), 3.67 (s, 4H), 5.77 (q, J=8.0 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 7.01 (t, J=8.0 Hz, 1H), 7.17 (t, J=8.0 Hz, 1H), 7.35 (d, J=8.0 Hz, 2H), 7.45 (d, J=8.0 Hz, 1H), 7.54 (s, 1H), 7.69 (d, J=8.0 Hz, 2H), 7.78 (d, J=4.0 Hz, 1H), 7.90 (d, J=4.0 Hz, 1H), 8.66 (d, J=4.0 Hz, 1H), 10.43 (s, 1H).

Example 18

The title compound was prepared using a procedure similar to that used to prepare Example 15 where 2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)-6,7-dihydro-5H-cyclopenta[b]pyridine-3-carboxylic acid was used in place of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid in step a. ESI-MS m z: 715.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.20 (d, J=4.0 Hz, 3H), 1.76-1.59 (m, 6H), 2.15-1.98 (m, 4H), 2.28-2.19 (m, 2H), 2.79 (t, J=4.0 Hz, 4H), 3.49 (t, J=4.0 Hz, 4H), 3.65 (s, 4H), 4.44-4.34 (m, 1H), 5.77 (q, J=8.0 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 7.01 (t, J=8.0 Hz, 1H), 7.18 (t, J=8.0 Hz, 1H), 7.36 (d, J=8.0 Hz, 2H), 7.45 (d, J=8.0 Hz, 1H), 7.54 (d, J=8.0 Hz, 1H), 7.68 (d, J=8.0 Hz, 2H), 7.85 (d, J=4.0 Hz, 1H), 7.92 (d, J=4.0 Hz, 1H), 8.82 (d, J=4.0 Hz, 1H), 10.44 (s, 1H).

Example 19

The title compound was prepared using a procedure similar to that used to prepare Example 15 where 5-cyclopropyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid was used in place of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid in step a. ESI-MS m z: 701.28 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.60 (p, J=4.5 Hz, 2H), 0.66 (dt, J=5.0, 3.0 Hz, 2H), 0.73 (td, J=7.0, 4.7 Hz, 2H), 0.84-0.93 (m, 2H), 1.19 (d, J=6.9 Hz, 3H), 1.65 (t, J=5.2 Hz, 4H), 1.86 (td, J=8.5, 4.3 Hz, 1H), 2.80-2.87 (m, 1H), 3.45-3.51 (m, 4H), 3.64 (s, 4H), 5.77 (q, J=6.9 Hz, 1H), 6.66 (d, J=8.1 Hz, 1H), 7.00 (t, J=8.0 Hz, 1H), 7.18 (t, J=7.7 Hz, 1H), 7.35 (dd, J=8.1, 5.3 Hz, 3H), 7.45 (d, J=7.8 Hz, 1H), 7.68 (d, J=8.3 Hz, 2H), 7.77 (d, J=4.1 Hz, 1H), 7.90 (d, J=4.0 Hz, 1H), 8.06 (d, J=2.3 Hz, 1H), 8.67 (d, J=4.1 Hz, 1H), 10.49 (s, 1H).

Example 20

The title compound was prepared using a procedure similar to that used to prepare Example 15 where 5-cyclopropyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid was used in place of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid in step a. ESI-MS m z: 715.30 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.61-0.69 (m, 2H), 0.82-0.93 (m, 2H), 1.13-1.26 (m, 3H), 1.61-1.75 (m, 6H), 1.86 (tt, J=8.5, 5.1 Hz, 1H), 2.07 (dt, J=11.2, 9.3 Hz, 2H), 2.17-2.29 (m, 2H), 2.87 (s, 1H), 3.48 (s, 4H), 3.64 (s, 3H), 4.39 (h, J=8.1 Hz, 1H), 5.77 (q, J=6.9 Hz, 1H), 6.66 (d, J=8.0 Hz, 1H), 7.00 (td, J=7.7, 1.5 Hz, 1H), 7.18 (td, J=7.6, 1.3 Hz, 1H), 7.28-7.45 (m, 3H), 7.45 (dd, J=7.9, 1.5 Hz, 1H), 7.65-7.75 (m, 2H), 7.85 (d, J=4.0 Hz, 1H), 7.91 (d, J=4.1 Hz, 1H), 8.06 (d, J=2.3 Hz, 1H), 8.83 (d, J=7.6 Hz, 1H), 10.49 (s, 1H).

Example 21

The title compound was prepare using a procedure similar to that used to prepare Example 15 where 5-ethyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid was used in place of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid in step a. ESI-MS m z: 689.28 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.55-0.69 (m, 2H), 0.72 (dt, J=6.9, 3.3 Hz, 2H), 1.12-1.28 (m, 6H), 1.66 (t, J=5.1 Hz, 4H), 2.55 (d, J=7.6 Hz, 1H), 2.80-2.87 (m, 1H), 3.49 (d, J=4.9 Hz, 5H), 3.67 (s, 4H), 5.77 (q, J=6.8 Hz, 1H), 6.67 (d, J=8.0 Hz, 1H), 7.00 (td, J=7.7, 1.5 Hz, 1H), 7.18 (td, J=7.6, 1.3 Hz, 1H), 7.37 (d, J=8.2 Hz, 2H), 7.45 (dd, J=7.9, 1.5 Hz, 1H), 7.58 (d, J=2.3 Hz, 1H), 7.69 (d, J=8.3 Hz, 2H), 7.78 (d, J=4.0 Hz, 1H), 7.90 (d, J=4.1 Hz, 1H), 8.08 (d, J=2.3 Hz, 1H), 8.67 (d, J=4.2 Hz, 1H), 10.53 (s, 1H).

Example 22

The title compound was prepared using a procedure similar to that used to prepare Example 15 where 5-ethyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid was used in place of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid in step a. ESI-MS m z: 703.30 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.12-1.27 (m, 6H), 1.62-1.77 (m, 6H), 1.97-2.15 (m, 2H), 2.23 (tq, J=7.3, 3.6, 2.7 Hz, 2H), 2.54 (d, J=7.6 Hz, 1H), 3.48 (s, 5H), 3.65 (s, 4H), 4.39 (h, J=8.2 Hz, 1H), 5.77 (q, J=6.9 Hz, 1H), 6.66 (d, J=8.1 Hz, 1H), 7.00 (td, J=7.7, 1.6 Hz, 1H), 7.18 (td, J=7.6, 1.3 Hz, 1H), 7.36 (d, J=8.2 Hz, 2H), 7.45 (dd, J=7.9, 1.5 Hz, 1H), 7.56 (d, J=2.3 Hz, 1H), 7.69 (d, J=8.3 Hz, 2H), 7.85 (d, J=4.1 Hz, 1H), 7.91 (d, J=4.1 Hz, 1H), 8.08 (d, J=2.3 Hz, 1H), 8.83 (d, J=7.6 Hz, 1H), 10.52 (s, 1H).

Example 23

The title compound was prepared using a procedure similar to that used to prepare Example 15 where 2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)-5-(trifluoromethyl)nicotinic acid was used in place of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid in step a. ESI-MS m z: 729.45 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.56-0.64 (m, 2H), 0.73 (dt, J=3.3, 6.9 Hz, 2H), 1.14-1.27 (m, 5H), 1.69 (t, J=5.1 Hz, 4H), 2.80-2.92 (m, 1H), 3.50 (t, J=5.1 Hz, 4H), 3.81 (s, 4H), 5.78 (q, J=6.8 Hz, 1H), 6.68 (d, J=8.1 Hz, 1H), 6.97-7.05 (m, 1H), 7.19 (td, J=1.3, 7.6 Hz, 1H), 7.39 (d, J=8.3 Hz, 2H), 7.45 (dd, J=1.5, 7.8 Hz, 1H), 7.68 (d, J=8.3 Hz, 2H), 7.78 (d, J=4.0 Hz, 1H), 7.90 (d, J=4.1 Hz, 1H), 8.00 (d, J=2.4 Hz, 1H), 8.52 (d, J=2.3 Hz, 1H), 8.66 (d, J=4.2 Hz, 1H), 10.68 (s, 1H).

Example 24

The title compound was prepared using a procedure similar to that used to prepare Example 15 where 2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)-5-(trifluoromethyl)nicotinic acid was used in place of 6-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid in step a. ESI-MS m z: 743.50 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.20 (d, J=6.9 Hz, 4H), 1.69 (t, J=5.2 Hz, 6H), 2.01-2.16 (m, 2H), 2.24 (q, J=7.3 Hz, 2H), 3.50 (t, J=5.2 Hz, 4H), 3.80 (s, 4H), 4.38 (p, J=8.1 Hz, 1H), 5.78 (q, J=6.9 Hz, 1H), 6.67 (d, J=8.1 Hz, 1H), 7.00 (td, J=1.5, 7.7 Hz, 1H), 7.18 (td, J=1.3, 7.7 Hz, 1H), 7.39 (d, J=8.2 Hz, 2H), 7.45 (dd, J=1.5, 7.8 Hz, 1H), 7.68 (d, J=8.3 Hz, 2H), 7.85 (d, J=4.0 Hz, 1H), 7.92 (d, J=4.1 Hz, 1H), 8.00 (d, J=2.4 Hz, 1H), 8.49-8.55 (m, 1H), 8.81 (d, J=7.6 Hz, 1H), 10.68 (s, 1H).

Example 25

The title compound was prepared using a procedure similar to that used to prepare Example 4 where ethyl (2R)-2-aminopropanoate was used in place of ethyl (2R)-2-aminopropanoate. ESI-MS m z: 669.40 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.62 (m, 2H), 0.72 (dt, J=6.8, 3.3 Hz, 2H), 1.17 (d, J=6.9 Hz, 3H), 1.65 (t, J=5.1 Hz, 4H), 2.19 (s, 3H), 2.88 (tq, J=7.8, 4.1 Hz, 1H), 3.48 (t, J=5.2 Hz, 4H), 3.65 (s, 4H), 5.88 (q, J=6.9 Hz, 1H), 6.71 (d, J=8.1 Hz, 1H), 7.04 (t, J=7.7 Hz, 1H), 7.20 (t, J=7.6 Hz, 1H), 7.37 (d, J=8.3 Hz, 2H), 7.51-7.57 (m, 2H), 7.69 (d, J=8.3 Hz, 2H), 7.98 (d, J=8.2 Hz, 2H), 8.06 (d, J=2.2 Hz, 1H), 8.20 (d, J=8.2 Hz, 2H), 8.62 (d, J=4.3 Hz, 1H), 10.52 (s, 1H).

Example 26

The title compound was prepared using a procedure similar to that used to prepare Example 5 where ethyl (2R)-2-aminopropanoate was used in place of ethyl (2R)-2-aminopropanoate. ESI-MS m z: 737.45 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.21 (d, J=7.0 Hz, 3H), 1.66 (t, J=5.2 Hz, 4H), 2.20 (s, 3H), 2.26 (s, 3H), 3.48 (t, J=5.2 Hz, 4H), 3.65 (s, 4H), 5.92 (q, J=6.8 Hz, 1H), 6.74 (d, J=8.1 Hz, 1H), 7.06 (td, J=7.7, 1.6 Hz, 1H), 7.17 (d, J=8.2 Hz, 2H), 7.19-7.34 (m, 2H), 7.39 (d, J=8.3 Hz, 2H), 7.52-7.61 (m, 2H), 7.71 (d, J=8.4 Hz, 2H), 8.07 (d, J=2.2 Hz, 1H), 8.17 (d, J=8.2 Hz, 2H), 8.30 (d, J=8.3 Hz, 2H), 10.10 (s, 1H), 10.53 (s, 1H).

Example 27

Example 27 Step a

To a 50-mL round-bottom flask were added 1-fluoro-2-nitrobenzene (5.0 g, 35.43 mmol), methyl 2-amino-2-methylpropanoate (8.30 g, 70.87 mmol), DIPEA (18.32 g, 141.74 mmol) and DMSO (10 mL). The resulting solution was stirred for 24 hrs at 50° C. and then diluted with ethyl acetate (200 mL). The organic layer was washed with brine (50 mL×3), dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (4.3 g, 50.93%) as yellowish oil. ESI-MS m/z: 239.10 [M+H]⁺.

Example 27 Step b

To a 50-mL round-bottom flask were added the compound from step a (4.30 g, 18.04 mmol), LiOH (4.32 g, 180 mmol), CH₃OH (10 mL) and H₂O (10 mL). The resulting solution was stirred for 2 hrs at room temperature. The pH value of the solution was adjusted to 6 with aq. HCl. The resulting solution was extracted with ethyl acetate (100 mL×3) and the combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (3.6 g, 89.0%) as a yellow solid. ESI-MS m z: 225.08 [M+H]⁺.

Example 27 Step c

To a 50-mL round-bottom flask were added the compound from step b (700 mg, 3.12 mmol), DIPEA (806 mg, 6.24 mmol), N,O-dimethylhydroxylamine (381 mg, 6.24 mmol), HATU (3561 mg, 9.36 mmol) and DMF (10 mL). The resulting solution was stirred for 3 hrs at room temperature and then diluted with ethyl acetate (100 mL). The organic layer was washed with brine (50 mL×3), dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford desired product (740 mg, 88.7%) as an orange solid. ESI-MS m z: 268.12 [M+H]⁺.

Example 27 Step d

To a stirred solution of 2,5-dibromothiophene (2.68 g, 11.07 mmol) in THE (20 mL) was added n-BuLi (4.00 mL, 42.46 mmol) dropwise at −40° C. under nitrogen atmosphere. The resulting mixture was stirred for 15 min, then the compound from step c (740 mg, 2.76 mmol) in THF (5 mL) was added dropwise at −40° C. The resulting mixture was stirred for 1 h at room temperature and then quenched with water (100 mL) at room temperature. The reaction mixture was extracted with ethyl acetate (100 mL×3) and the combined organic layer was washed with brine, dried over anhydrous Na₂SO₄ and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (520 mg, 50.87%) as yellowish oil. ESI-MS m z: 368.98 [M+H]⁺.

Example 27 Step e

To a 50-mL round-bottom flask were added the compound from step d (520 mg, 1.40 mmol), NH₄Cl (753 mg, 14.08 mmol), Fe (786 mg, 14.08 mmol), EtOH (15 mL) and H₂O (15 mL). The resulting solution was heated for 1 h at 80° C. After filtered through Celite, the filtrate was extracted with ethyl acetate (100 mL×3). The combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (400 mg, 88.4%) as a yellowish oil. ESI-MS m z: 321.00 [M+H]⁺.

Example 27 Step f

To a 100-mL round-bottom flask were added the compound from step e (470 mg, 1.46 mmol), 4-nitro-benzoyl chloride (542 mg, 2.92 mmol), pyridine (0.5 mL) and DCM (20 mL). After heated at 50° C. for 12 hrs, the reaction mixture was cooled down to rt and then diluted with DCM (200 mL). The organic layer was washed with brine, dried over anhydrous Na₂SO₄ and concentrated. The crude residue was purified by silica gel column chromatography eluting with 0-50% ethyl acetate/hexanes to obtain the desired product (650 mg) as a yellow solid. ESI-MS m z: 470.01 [M+H]⁺.

Example 27 Step g

To a 100-mL round-bottom flask were added the compound from step f (500 mg, 1.06 mmol), Pd(OAc)₂ (47 mg, 0.21 mmol), dppp (175 mg, 0.42 mmol), TEA (3 mL), EtOH (12 mL) and DMF (12 mL). The resulting mixture was heated at 70° C. for 12 hrs under 10 atm CO atmosphere. After cooled down to rt and evaporated the solvents, the crude residue was purified by silica gel column chromatography eluting with 0-10% MeOH/DCM to afford the desired product (320 mg, 64.9%) as a pale yellow solid. ESI-MS m z: 434.15 [M+H]⁺.

Example 27 Step h

A solution of 5-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid (387 mg, 1.47 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (295 mg, 2.21 mmol) in DCM (10 mL) was stirred for 0.5 h at room temperature under nitrogen atmosphere. Then the reaction mixture was evaporated under vacuum and dissolved in DCM (10 mL). To this solution, the compound from step g (320 mg, 0.73 mmol) and pyridine (0.5 mL) were added at 0° C. The resulting mixture was stirred for 0.5 h at 0° C. and then diluted with DCM (100 mL). The organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (300 mg, 59.9%) as a yellow solid. ESI-MS m z: 678.27 [M+H]⁺.

Example 27 Step i

A solution of the compound from step h (300 mg, 0.44 mmol) and LiOH (10 mg, 0.43 mmol) in EtOH:H₂O=2:1 (30 mL) was stirred for 1 h at room temperature. The pH of the resulting solution was adjusted to 6 with aq. HCl and then diluted with ethyl acetate (200 mL). The organic layer was washed with brine, dried and concentrated to afford the desired product (160 mg, 80%) as a yellow solid. ESI-MS m z: 650.24 [M+H]⁺.

Example 27 Step j

A solution of the compound from step i (80 mg, 0.12 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (49 mg, 0.36 mmol) in DCM (10 mL) was stirred for 0.5 h at room temperature under nitrogen atmosphere. The resulting mixture was concentrated under vacuum and then dissolved in DCM (10 mL). To this solution, cyclopropanamine (14 mg, 0.23 mmol) and pyridine (0.5 mL) were added at 0° C. The resulting mixture was stirred for 0.5 h at 0° C. and then concentrated under vacuum. The crude residue was purified by Prep-HPLC (CH₃CN/H₂O) to afford the desired product (43.1 mg, 50.7%) as a pale yellow solid. ESI-MS m z: 689.28 [M+H]⁺. ¹H NMR (400 MHz, Methanol-d₄) δ 0.57-0.65 (m, 2H), 0.73-0.84 (m, 2H), 1.89 (t, J=5.3 Hz, 4H), 1.98 (s, 6H), 2.36 (s, 3H), 2.79 (tt, J=7.4, 3.9 Hz, 1H), 3.65 (t, J=5.2 Hz, 4H), 4.10 (s, 4H), 7.29 (d, J=4.2 Hz, 1H), 7.40-7.53 (m, 3H), 7.60 (d, J=8.1 Hz, 1H), 7.80 (t, J=8.4 Hz, 3H), 7.92-8.02 (m, 3H), 8.15 (d, J=2.1 Hz, 1H).

Example 28

The title compound was prepared using a procedure similar to that used to prepare Example 27 where cyclobutylamine was used in place of cyclopropanamine. ESI-MS m z: 703.30 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.60-1.71 (m, 5H), 1.69 (s, 2H), 1.86 (s, 5H), 1.96-2.10 (m, 1H), 2.11 (dd, J=10.9, 8.3 Hz, 1H), 2.17-2.29 (m, 5H), 3.47 (t, J=5.3 Hz, 4H), 3.64 (s, 4H), 4.39 (h, J=8.3 Hz, 1H), 6.42 (dd, J=8.0, 1.3 Hz, 1H), 6.92 (td, J=7.7, 1.7 Hz, 1H), 7.00 (td, J=7.5, 1.3 Hz, 1H), 7.32 (dd, J=7.7, 1.6 Hz, 1H), 7.51-7.80 (m, 7H), 8.06 (d, J=2.2 Hz, 1H), 8.77 (d, J=7.7 Hz, 1H), 10.57 (s, 1H).

Example 29

Example 29 Step a

A solution of (2R)-2-[(tert-butoxycarbonyl)amino]propanoic acid (18.0 g, 95.13 mmol), DIPEA (25.0 g, 190.26 mmol), HATU (72.0 g, 190.26 mmol) and N,O-dimethylhydroxylamine hydrochloride (18.0 g, 190.26 mmol) in DMF (30 mL) was stirred for 16 hrs at room temperature. The resulting solution was diluted with ethyl acetate (500 mL). The organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (12.5 g, 56%) as a white solid. ESI-MS m z: 233.25 [M+H]⁺.

Example 29 Step b

A solution of 2,5-dibromothiophene (47.0 g, 193.73 mmol) in THE (100 mL) was added n-BuLi (69 mL, 172.21 mmol) at −50° C. under nitrogen atmosphere. The resulting mixture was stirred for 15 min at −50° C., and then the compound from step a (10.0 g, 43.05 mmol) in THE (50 mL) was added slowly at −50° C. The resulting solution was warmed to room temperature and further stirred for 1 h. The resulting solution was diluted with ethyl acetate (1000 mL) and the organic layer was washed with brine, dried and concentrated. The crude residue was purified by silica gel column chromatography eluting with 0-20% ethyl acetate/hexanes to afford the desired product (12.6 g, 87%) as a yellow solid. ESI-MS m z: 334.05 [M+H]⁺.

Example 29 Step c

A solution of the compound from step b (1.0 g, 2.99 mmol) in DCM (10 mL) was added 4 N HCl in 1,4-dioxane (10 mL). The resulting mixture was stirred for 1 h at room temperature and then pH value of the solution was adjusted to 9 with aq. NaHCO₃. After extracted with ethyl acetate (50 mL×3), the organic layer was washed with brine, dried and concentrated to afford the desired product (crude) as a yellow oil which will be used directly for the next step. ESI-MS m z: 233.85 [M+H]⁺.

Example 29 Step d

A solution of the compound from step c (crude) in NMP (3 mL) was added 3-fluoro-2-nitropyridine (667 mg, 4.69 mmol). The resulting mixture was heated at 50° C. for 16 hrs. The crude product was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (500 mg) as a yellow solid. ESI-MS m/z: 355.90 [M+H]⁺.

Example 29 Step e

A solution of the compound from step d (500 mg, 1.40 mmol), NH₄Cl (751 mg, 14.03 mmol) and Fe (784 mg, 14.03 mmol) in EtOH:H₂O=2:1 (30 mL) was heated for 1 h at 80° C. After filtered through Celite, the filtrate was extracted with ethyl acetate (50 mL×3). The organic layer was washed with brine, dried and concentrated. The crude product was purified by silica gel column chromatography eluting with 0-50% ethyl acetate/hexanes to afford the desired product (300 mg, 69%) as a yellow solid. ESI-MS m/z: 307.85 [M+H]⁺.

Example 29 Step f

A solution of the compound from step e (300 mg, 0.97 mmol), pyridine (232 mg, 2.92 mmol) and 4-nitrobenzoyl chloride (217 mg, 1.16 mmol) in DCM (10 mL) was stirred for 16 hrs at room temperature. After evaporated the solvent, the crude residue was purified by silica gel column chromatography eluting with 0-50% ethyl acetate/hexanes to afford the desired product (crude) as a yellow oil which will be used directly for the next step. ESI-MS m z: 456.95 [M+H]⁺.

Example 29 Step g

A solution of the compound from step f (crude), Pd(OAc)₂ (29 mg, 0.13 mmol) and dppp (108 mg, 0.26 mmol) in EtOH:DMF:TEA=4:4:1 (9 mL) was heated at 70° C. for 16 hrs under 10 atm CO atmosphere. The resulting mixture was concentrated under vacuum. The crude residue was purified by silica gel column chromatography eluting with 0-80% ethyl acetate/hexanes to afford the desired product (300 mg) as a yellow solid. ESI-MS m z: 421.10 [M+H]⁺.

Example 29 Step h

A solution of 5-methyl-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)nicotinic acid (224 mg, 0.85 mmol) and (1-chloro-2-methylprop-1-en-1-yl)dimethylamine (286 mg, 2.14 mmol) in DCM (10 mL) was stirred for 2 hrs at room temperature. Then the resulting mixture was concentrated under vacuum and the residue was dissolved in DCM (10 mL). To this solution, the compound from step g (300 mg, 0.71 mmol) and pyridine (169 mg, 2.14 mmol) in DCM (10 mL) were added at 0° C. The resulting solution was stirred for 0.5 h at 0° C. and then diluted with DCM (100 mL). The organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) to afford the desired product (200 mg, 42%) as a yellow solid. ESI-MS m z: 665.25 [M+H]⁺.

Example 29 Step i

A solution of the compound from step h (200 mg, 0.30 mmol) and LiOH (36 mg, 1.50 mmol) in EtOH:H₂O=2:1 (30 mL) was stirred for 1 h at room temperature. The pH value of the resulting solution was adjusted to 6 with aq. HCl. The resulting mixture was extracted with ethyl acetate (20 mL×3). The organic layer was washed with brine, dried and concentrated. The crude residue was purified by silica gel column chromatography eluting with 0-100% ethyl acetate/hexanes to afford the desired product (70 mg, 17%) as a yellow solid. ESI-MS m z: 637.20 [M+H]⁺.

Example 29 Step j

A solution of the compound from step i (70 mg, 0.11 mmol), DIPEA (42 mg, 0.33 mmol), HATU (63 mg, 0.16 mmol) and cyclobutylamine hydrochloride (23 mg, 0.22 mmol) in DMF (3 mL) was stirred for 1 h at room temperature. The resulting solution was extracted with ethyl acetate (20 mL×3). The combined organic layer was washed with brine, dried and concentrated. The crude residue was purified by reverse phase C18 column chromatography (CH₃CN/H₂O) and by Chiral-Prep-HPLC to afford the desired product (25.6 mg, 33%) as a yellow solid. ESI-MS m/z: 690.50 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.23 (d, J=6.9 Hz, 3H), 1.61-1.73 (m, 6H), 2.01-2.15 (m, 2H), 2.19 (s, 3H), 2.22 (s, 2H), 3.48 (t, J=5.1 Hz, 4H), 3.65 (s, 4H), 4.39 (h, J=8.1 Hz, 1H), 5.77 (q, J=6.9 Hz, 1H), 7.06 (dd, J=8.0, 4.6 Hz, 1H), 7.11 (d, J=8.1 Hz, 1H), 7.41 (d, J=8.3 Hz, 2H), 7.54 (d, J=2.3 Hz, 1H), 7.71 (d, J=8.4 Hz, 2H), 7.87 (d, J=4.1 Hz, 1H), 8.02 (d, J=4.1 Hz, 1H), 8.06 (dd, J=2.3, 0.8 Hz, 1H), 8.29 (dd, J=4.5, 1.7 Hz, 1H), 8.87 (d, J=7.5 Hz, 1H), 10.55 (s, 1H).

Example 30

The title compound was prepared using a procedure similar to that used to prepare Example 29 except step i where 2-fluoro-3-nitropyridine was used in place of 3-fluoro-2-nitropyridine. ESI-MS m z: 676.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 0.60 (d, J=3.4 Hz, 2H), 0.72 (dd, J=7.1, 4.7 Hz, 2H), 1.26 (d, J=6.9 Hz, 3H), 1.65 (s, 4H), 2.19 (s, 3H), 2.84 (m, 1H), 3.48 (s, 4H), 3.64 (s, 4H), 5.81 (q, J=7.0 Hz, 1H), 7.20 (dd, J=7.7, 4.8 Hz, 1H), 7.33 (d, J=8.5 Hz, 2H), 7.53 (d, J=2.2 Hz, 1H), 7.62 (d, J=8.5 Hz, 2H), 7.79 (d, J=4.0 Hz, 1H), 7.84 (dd, J=7.8, 1.7 Hz, 1H), 7.91 (dd, J=4.8, 1.7 Hz, 1H), 8.01 (d, J=4.2 Hz, 1H), 8.05 (s, 1H), 8.68 (d, J=4.2 Hz, 1H), 10.48 (s, 1H).

Example 31

The title compound was prepared using a procedure similar to that used to prepare Example 30 where cyclobutanamine was used in place of cyclopropanamine. ESI-MS m z: 690.25 [M+H]⁺. ¹H NMR (400 MHz, DMSO-d₆) δ 1.27 (d, J=6.9 Hz, 3H), 1.61-1.73 (m, 6H), 2.01-2.15 (m, 2H), 2.19 (s, 3H), 2.20-2.26 (m, 2H), 3.48 (t, J=5.2 Hz, 4H), 3.64 (s, 4H), 4.38 (q, J=8.2 Hz, 1H), 5.81 (q, J=6.9 Hz, 1H), 7.20 (dd, J=7.8, 4.8 Hz, 1H), 7.33 (d, J=8.7 Hz, 2H), 7.53 (d, J=2.3 Hz, 1H), 7.62 (d, J=8.4 Hz, 2H), 7.80-7.90 (m, 2H), 7.90 (dd, J=4.9, 1.7 Hz, 1H), 8.00-8.08 (m, 2H), 8.84 (d, J=7.6 Hz, 1H), 10.48 (s, 1H).

Assays

INTRODUCTION

RSV is a single stranded negative sense RNA virus that causes respiratory tract infections which can be dangerous to infants, the elderly, and immunosuppressed individuals. Currently there is no vaccine, and therapeutic options are both costly and of limited effectiveness. These approved treatments are Ribavirin, and Palivizumab/Synagis (a monoclonal antibody). RSV has two genotypes, A and B, which differ primarily in the structure of the virus' surface “G” attachment protein. Our current primary screen focusses on RSV-A and uses an in vitro cytoprotection assay where compounds are added in 2-fold dilutions to cells which are then subjected to fully replicative viral particles. Cell viability is measured several days later along with separate measurements of compound cytotoxicity. This report focuses on the results of our most recent screening of compounds.

Methods

HEp-2 cells, (originally derived from tumors grown in irradiated-cortisonised weanling rats that had been injected with epidermoid carcinoma tissue from a 56 year old male's larynx, but later found to be indistinguishable from HeLa cells by PCR DNA analysis), were used for the culturing of genotype A, “Long” strain RSV. Flasks were inoculated with RSV and viral stocks were collected once cytopathic effect (CPE) was greater than 90%. Viral stocks in 25% sucrose media were snap frozen using liquid nitrogen to increase viral stability. Viral stock titers were quantified by tissue culture infectious dose 50% (TCID₅₀) using 8,000 cells per well and 3-fold viral dilutions across a 96-well plate, cultured for 4 days.

The control compound currently used in the RSV assay is RSV-604, a˜2.4 μM EC₅₀ nucleocapsid inhibitor previously developed by Novartis. Following extensive parameter testing, the final assay is run as follows: HEp-2 cells are seeded into the inner 60 wells of a 96-well plate at 8,000 cells per well in a volume of 50 μL using Growth Media (DMEM without phenol red, 1% L-Glut, 1% Penn/Strep, 1% nonessential amino acids, 10% FBS). 2-Fold serial dilutions of control and test compounds are added to the wells in duplicate in a total volume of 25 μL. Viral stock is then added to the wells in a volume of 25 μL, bringing the total volume of each well to 100 μL. Each 96-well plate has a control column of 6 wells with cells and virus but no compound (negative control, max CPE), a column with cells but no compound or virus (positive control, minimum CPE), and a column with no cells or virus or compound (background plate/reagent control). The control wells with cells but no virus are given an additional 25 uL of growth media containing an equal quantity of sucrose as those wells receiving the viral stock in order to keep consistent in media and volume conditions. The outer wells of the plate are filled with 125 μL of growth media to act as a thermal and evaporative moat around the test wells. Following a 4-day incubation period, the plates are read using ATPlite (50 uL added per well), which quantifies the amount of ATP (a measure of cell health) present in each well. Assay plates are read using the Envision luminometer. In parallel, cytotoxicity is examined on an additional 96-well plate treated in an identical manner, but substituting the 25 μL of viral stock for 25 μL of growth media. These data are used to calculate the EC₅₀ of each compound. EC₅₀ ranges are as follows: A<0.01 μM; B 0.01-0.05 μM; C>0.05 μM.

TABLE 1 Summary of Activities Human RSV-A Human RSV-A (“Long” strain) (“Long” strain) Example EC50 Example EC50 1 B 2 C 3 C 4 C 5 C 6 A 7 B 8 A 9 A 10 B 11 A 12 A 13 A 14 B 15 A 16 A 17 A 18 A 19 A 20 A 21 A 22 A 23 B 24 B 25 C 26 C 27 C 28 A 29 B 30  C. 31 B

While this invention has been particularly shown and described with references to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims. 

What is claimed:
 1. A compound represented by Formula (I):

or a pharmaceutically acceptable salt thereof, wherein: A is selected from the group consisting of: 1) optionally substituted aryl; and 2) optionally substituted heteroaryl; B is selected from the group consisting of: 1) optionally substituted —C₁-C₆ alkyl; 2) optionally substituted aryl; 3) optionally substituted heteroaryl; 4) optionally substituted —C₃-C₁₂ cycloalkyl; and 5) optionally substituted 3- to 12-membered heterocycloalkyl; L is absent, —CONH—, —NHCO—, —NHCO₂—, or —NHS(O)₂—; preferably L is —CONH—; Z₁, Z₂, Z₃ and Z₄ are each —C(R₁)— or N, provided that at least two of Z₁, Z₂, Z₃ and Z₄ are —C(R₁)—; Each R₁ is independently selected from the group consisting of: 1) hydrogen; 2) halogen; 3) cyano; 4) nitro; 5) optionally substituted —C₁-C₈ alkoxy; 6) optionally substituted —C₁-C₈ alkyl; 7) optionally substituted —C₂-C₈ alkynyl; 8) optionally substituted —C₃-C₆ cycloalkyl; and 9) optionally substituted 3- to 6-membered heterocycloalkyl; Each R₂ and R₃ is independently selected from the group consisting of: 1) halogen; 2) cyano; 3) nitro; 4) optionally substituted —C₁-C₈ alkoxy; 5) optionally substituted —C₁-C₈ alkyl; 6) optionally substituted —C₂-C₈ alkynyl; 7) optionally substituted —C₃-C₆ cycloalkyl; and 8) optionally substituted 3- to 6-membered heterocycloalkyl; alternatively two adjacent R₃ groups are taken together with the carbon atoms to which they are attached to form an optionally substituted fused carbocyclic or heterocyclic ring; Each R₄ and R₅ is independently selected from the group consisting of: 1) hydrogen; and 2) optionally substituted —C₁-C₃ alkyl; Alternatively, R₄ and R₅ are taken together with the carbon atom to which they are attached to form an optionally substituted 3- to 6-membered spiro-carbocyclic or spiro-heterocyclic ring; m is 0, 1, 2, 3 or 4; and v is 0, 1, 2, or
 3. 2. The compound of claim 1, wherein L is —CONH—.
 3. The compound of claim 1, wherein A is selected from one of the following groups by removal of two hydrogen atoms, wherein each of the groups is optionally substituted when possible:


4. The compound of claim 1, wherein A is selected from one of the following groups, wherein each of the groups is optionally substituted:


5. The compound of claim 1, wherein B is selected from one of the following groups by removal of a hydrogen atom, wherein each of the groups is optionally substituted when possible:


6. The compound of claim 1, represented by one of Formulas (II-a), (II-b), and (II-c), or a pharmaceutically acceptable salt thereof:

wherein A, B, Z₁, Z₂, Z₃, Z₄, R₂, R₃, R₄, R₅, m, and v are as defined in claim
 1. 7. The compound of claim 1, represented by one of Formulas (IX-a), (IX-b), and (IX-c), or a pharmaceutically acceptable salt thereof:

—O—, —C(R₁₁)(R₁₂)— or —N(R₁₁)—; R₁₁ and R₁₂ are each hydrogen or optionally substituted —C₁-C₃ alkyl; n is 0, 1, 2, or 3; and A, B, Z₁, Z₂, Z₃, Z₄, R₄, and R₅ are as defined in claim
 1. 8. The compound of claim 1, represented by one of Formulas (IX-a)˜(IX-c), or a pharmaceutically acceptable salt thereof:

wherein A, B, Z₁, Z₂, Z₃, Z₄, R₄, and R₅ are as defined in claim
 1. 9. The compound of claim 1, represented by one of Formulas (IV-a), (IV-b), and (IV-c), or a pharmaceutically acceptable salt thereof:

wherein A, B, Z₁, Z₂, Z₃, Z₄, R₃, R₄ and R₅ are as defined in claim
 1. 10. The compound of claim 1, represented by one of Formulas (V-a), (V-b), (V-c), (VI-a), (VI-b), (VI-c), (VII-a), (VII-b), (VII-c), or a pharmaceutically acceptable salt thereof:

wherein A, B, R₃, R₄ and R₅ are as defined in claim
 1. 11. The compound of claim 1, represented by one of Formulas (VIII-a), (VIII-b), (VIII-c), (VIII-d), (VIII-e), and (VIII-f), or a pharmaceutically acceptable salt thereof:

wherein B, R₃, R₄, and R₅ are as defined in claim
 1. 12. The compound of claim 1, represented by one of Formulas (VIII-a2), (VIII-b2), (VIII-c2), (VIII-d2), (VIII-e2), and (VIII-f2), or a pharmaceutically acceptable salt thereof:

wherein B, R₃, and R₅ are as defined in claim
 1. 13. The compound of claim 1, selected from the compounds set forth below or a pharmaceutically acceptable salt thereof: Compound Structure 1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31


14. A pharmaceutical composition comprising a compound according to claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, diluent, or excipient.
 15. A method of treating or preventing an RSV infection in a subject in need thereof, comprising administering to the subject a therapeutically effective amount of a compound or a combination of compounds of claim
 1. 16. The method of claim 15, further comprising the step of administering to the subject an additional anti-RSV agent.
 17. The method of claim 15, further comprising administering to the subject a steroid anti-inflammatory compound.
 18. A method of treating an RSV infection and influenza in a subject in need thereof, comprising administering to the subject a therapeutically effective amount of a compound of claim 1 and a therapeutically effective amount of an anti-influenza agent.
 19. The method of claim 16, wherein the compound and the additional anti-RSV agent are co-formulated.
 20. The method of claim 16, wherein the compound and the additional anti-RSV agent are co-administered.
 21. The method of claim 16, wherein administering the compound allows for administering of the additional anti-RSV agent at a lower dose or frequency as compared to the administering of the additional anti-RSV agent alone that is required to achieve similar results in prophylactically treating an RSV infection in a subject in need thereof. 